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Flat wagons (sometimes flat beds, flats or rail flats, US: flatcars ), as classified by the International Union of Railways (UIC), are railway goods wagons that have a flat, usually full-length, deck (or 2 decks on car transporters) and little or no superstructure. By contrast, open wagons have high side and end walls and covered goods wagons have a fixed roof and sides. Flat wagons are often designed for the transportation of goods that are not weather-sensitive. Some flat wagons are able to be covered completely by tarpaulins or hoods and are therefore suitable for the transport of weather-sensitive goods. Unlike a "goods wagon with opening roof", the loading area of a flat is entirely open and accessible once the cover is removed.
Flats form a large proportion of goods wagons; for example in 1998 they comprised 40% of the total goods fleet owned by the German carrier, DB, the overwhelming majority of which were flat wagons with bogies.
Typical goods transported by these railway wagons are: vehicles, engines, large pipes, metal beams, wire coils, wire mesh, half-finished steel products, (sheets, coils, pipes, bars and plates), containers, rails, sleepers and complete sections of railway track. Gravel, sand and other bulk goods are transported on flat wagons with side panels.
Flat wagons are classified by the UIC into:
The main difference between the ordinary and special types of flat wagon is that the former always have to have a flat deck that can be driven on, whereas the special types do not have to be so designed. Within both types of flat wagon, there are variants with separate axles as well as bogie wagons.
In addition numerous other terms are used to classify flat wagons according to their purpose, but without clear and comprehensive specifications.
Attempts by the International Union of Railways (UIC) to standardise flat wagons go back to the 1950s. These efforts led to the establishment of characteristics for so-called "standard wagons". Standardised flat wagons are specified in the following UIC pamphlets:
The implementation of these guidelines is partly binding and partly voluntary for members of the UIC. Since the end of 1977, flat wagons that partially conform to these guidelines are identified by the designation "UIC". Flat beds that comply fully with the leaflets, and are therefore true UIC standard wagons, are given the designation "UIS St".
The Class K flats were originally one of the largest families of goods wagons, not least in Germany, thanks to the many older type stake wagons (stanchion wagons) that were assigned to it. The bulk of their work has since been taken over by special flat wagons. By 1998, DB only had 10,000 of this type left.
The majority of ordinary two-axle flat beds built since the 1950s were those with folding sides and short swivelling stanchions of UIC type 1 with, at least in Germany, an axle base of only 8 metres (26 ft 2+15⁄16 in).
UIC 571-1: Ordinary two-axle wagons | ||||
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Wagon type | Type 1 | Type 2 | Type 3A | Type 3B |
UIC class | Ks | Kns/Kjns | Kins/Kijns | Kilns/Kijlns |
Axle base | 9.00 m 29 ft 6+3⁄8 in | 10.00 m 32 ft 9+3⁄4 in | 10.00 m 32 ft 9+3⁄4 in | 10.00 m 32 ft 9+3⁄4 in |
Length over buffers | 13.86 m 45 ft 5+5⁄8 in | 16.55 m 54 ft 3+5⁄8 in | 16.55 m 54 ft 3+5⁄8 in | 16.55 m 54 ft 3+5⁄8 in |
Loading length, min. | 12.50 m 41 ft 1⁄8 in | 14.5 to 15.1 m 47 ft 6+7⁄8 in to 49 ft 6+1⁄2 in | 14.5 to 15.1 m 47 ft 6+7⁄8 in to 49 ft 6+1⁄2 in | 14.5 to 15.1 m 47 ft 6+7⁄8 in to 49 ft 6+1⁄2 in |
Loading area, about> | 35 m2 380 sq ft | 41.3 to 43.0 m2 445 to 463 sq ft | 41.3 to 43.0 m2 445 to 463 sq ft | 41.3 to 43.0 m2 445 to 463 sq ft |
Own weight, max. | 13.5 t 13.3 long tons; 14.9 short tons | 16.0 t 15.7 long tons; 17.6 short tons | 17.5 t 17.2 long tons; 19.3 short tons | 17.5 t 17.2 long tons; 19.3 short tons |
In recent years new K wagons have been developed. These have fixed ends and a tarpaulin cover and are therefore also suitable for hygroscopic goods. Their designation is Kils, based on the UIC classification of goods wagons.
In addition to the normal letters indicating length and weight (k, kk, n, m and mm) the Type K may also have the following index letters:
Today this class contains:
Only of historic significance, by contrast, are pod wagons (see below) and cradle wagons (see below). As a rule, L wagons do not have stanchions.
The most important index letters for basic classification of current types are:
The UIC has standardised three types of L wagon, the Class Lgss being based heavily on the Class Ks (see above):
UIC 571-3: Special goods wagons | UIC 571-4: Wagons for combined transport | ||
---|---|---|---|
Wagon type | Double-decker for vehicle transport | Container wagon | |
Type | Type 1 − Double wagon | Type 2 − Articulated wagon | Type 5 |
Class | Laaes | Laes | Lgss |
Axle base | 2 × 9.00 m 29 ft 6+3⁄8 in | 2 × 10.40 m 34 ft 1+1⁄2 in | 9.00 m 29 ft 6+3⁄8 in |
Length over buffers | 27.00 m 88 ft 7 in | 13.86 m 45 ft 5+5⁄8 in | |
Loading length, min. | 26.5 + 26.1 m 86 ft 11+1⁄4 in + 85 ft 7+1⁄2 in | 12.52 m 41 ft 7⁄8 in | |
Own weight, max. | 30.0 t 29.5 long tons; 33.1 short tons | 27.0 t 26.6 long tons; 29.8 short tons | 12.0 t 11.8 long tons; 13.2 short tons |
The standard mixed open flat wagon group has folding sides, stanchions and two or three axles.
The most important index letters for this group are:
The dimensions of the UIC standard wagon largely conform to the considerably more common Class Ks wagon (see above):
UIC 571-1: Ordinary two-axle wagons | |
---|---|
Wagon type | Open/Flat multi-purpose wagon |
Class | Os |
Axle base | 8.00 m 26 ft 3 in |
Length over buffers | 13.86 m 45 ft 5+5⁄8 in |
Loading length, min. | 12.61 m 41 ft 4+1⁄2 in |
Loading area, about | 36 m2 390 sq ft |
Loading volume, about | 29 m2 310 sq ft |
Unladen weight, max. | 14.0 t 13.8 long tons; 15.4 short tons |
.
The exclusively four-axle bogie wagons of Class R are equipped with a solid, level deck, usually made of wood, and, unless indicated otherwise by the code letters, also furnished with stanchions and end walls. Most types have short, removable, swivelling stanchions. They are especially suited to the transport of long steel elements, building materials, machines and large vehicles. In the 1990s, the DB purchased Class R wagons with long, sturdy, light metal stanchions and high end walls for the increasing amount of log transport required. In 1998, the DB had about 17,000 R wagons in service.
The most important index letters for distinguishing the basic types are as follows:
The UIC has specified two standard R wagons, both of which are very common e.g. in Germany. In the mid-1970s there was a switchover to newly built wagons with foldable sides.
UIC 571-2: Ordinary four-axle bogie wagons | ||
---|---|---|
Wagon type | Type 1 | Type 2 |
Class | R(e)s | R(e)mms |
Pivot pitch | 14.86 m 48 ft 9 in | 9.00 m 29 ft 6+3⁄8 in |
Length over buffers | 19.90 m 65 ft 3+1⁄2 in | 14.04 m 46 ft 3⁄4 in |
Loading length, min. | 18.50 m 60 ft 8+3⁄8 in | 12.64 m 41 ft 5+5⁄8 in |
Loading area, about | 51 m2 550 sq ft | 35 m2 380 sq ft |
Unladen weight, max. | 24.0 t 23.6 long tons; 26.5 short tons | 22.5 t 22.1 long tons; 24.8 short tons |
This is the largest group of flat wagons both in terms of variety and numbers. Their classification as special wagons arises either as a result of not having a wagon deck that is drivable or due to their axle count. Unlike the standard wagons, these flats are predominantly optimised for a specific purpose. In 1998 the DB had about 22,000 Class S wagons in its fleet.
The large variety of variants may be seen from the number of index letters, of which only the most important are given here; i.e. those that are needed to distinguish the basic types:
These wagons are so designed that the loading is limited only by the class of railway line, not the wagon itself. In order to keep the sag as low as possible, they are relatively short and thus mainly inscribed with the index letters mm.
The six-axle wagons with drivable decks of class Samm… are similar to the four-axle Rmm wagons, but are grouped with this special class due to the number of axles. In the Deutsche Bahn, these mainly consist of RRym wagons with a 90-tonne (89-long-ton; 99-short-ton) payload.
In considerably larger numbers, and designed for transporting steel coils, are the four and six-axle wagons equipped with loading troughs of the class S…hmm…. Some have fixed end walls and removable covers in the shape of tarpaulins or telescopic hoods. The Shimmns708 serving with the DB, which is the most common German S wagon, has an unladen weight of about 23 t (23 long tons; 25 short tons) and a loading limit of 67 t (66 long tons; 74 short tons) and is thus able to carry coils with a total weight of about 45 t (44 long tons; 50 short tons).
The UIC has standardized a four and a six-axle telescopic hood wagon for the transport of coils. Such wagons have been used in Germany since the 1970s and 1980s respectively, but usually fitted with (light) tarpaulins instead of the hoods:
UIC 571-3: Goods wagons of special type | ||
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Wagon type | Type 1 − four-axle | Type 2 − six-axle |
Class | Shimms to 1979: Shis | Sahimms to 1979: Sahis |
Pivot pitch | 7.00 m 22 ft 11+5⁄8 in | 8.00 m 26 ft 3 in |
Length over buffers | 12.04 m 39 ft 6 in | 15.00 m 49 ft 2+1⁄2 in |
Loading length, min. | 10.80 m 35 ft 5+1⁄4 in | 13.76 m 45 ft 1+3⁄4 in |
Unladen weight, max. | 22.0 t 21.7 long tons; 24.3 short tons | 34.0 t 33.5 long tons; 37.5 short tons |
The group known as wagons for combined transport have specific designs and equipment for the transport of the various transport units. The UIC has standardized several wagons, whose most important dimensions are given in the following table:
UIC 571-4: Goods wagons for combined transport | ||||||||
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Wagon type | Container wagon | Flat wagons for piggyback services | ||||||
Class | Type 1 with four axles, short | Type 2 with four axles, long | Type 4 with six axles | Type 1 Pocket wagon | Type 2 Kangourou wagon [5] | Type 3 Wippenwagen | ||
Class | Sg[kk]mmss | Sgjkkmmss | Sgss | Sgjss | Saggrss | Skss since 1980: Sdkms | Skss | Saass |
Pivot pitch | 10.75 m 35 ft 3+1⁄4 in | 11.30 m 37 ft 7⁄8 in | 14.60 m 47 ft 10+3⁄4 in | 15.80 m 51 ft 10 in | 10.70 m 35 ft 1+1⁄4 in | 11.20 m 36 ft 9 in | 11.00 m 36 ft 1+1⁄8 in | 11.60 m 38 ft 3⁄4 in |
Length over buffers | 15.79 m 51 ft 9+5⁄8 in | 16.94 m 55 ft 6+7⁄8 in | 19.64 m 64 ft 5+1⁄4 in | 21.00 m 68 ft 10+3⁄4 in | 27.10 m 88 ft 10+7⁄8 in | 16.44 m 53 ft 11+1⁄4 in | 16.24 m 53 ft 3+3⁄8 in | 31.87 m 104 ft 6+3⁄4 in |
Loading length, min. | 14.50 m 47 ft 6+7⁄8 in | 14.60 m 47 ft 10+3⁄4 in | 18.40 m 60 ft 4+3⁄8 in | 2 × 12.27 m 40 ft 3+1⁄8 in | − | − | − |
These wagons of Class Sg… are most common in combined transport. Their foldable trunnions (klappbare Tragzapfen) make them suitable for various transport systems. Some of these rail vehicles are equipped with long-stroke shock absorbers (index letter j) as special equipment for the protection of loads.
The use of Kangourou wagon and Wippenwagen remained restricted in the period from the 1960s to the 1980s, despite their utility in enabling horizontal cross-loading without cranes, because at that time facilities for swap body cross-loading were still widely available in western Europe.
The CargoSprinter, conceived as a goods wagon for the transport of ISO containers, did not get any further than trials.
These wagons for the ACTS roller container transport system with horizontal crossloading are common especially in Switzerland and the Netherlands. The Swiss wagons bear the national index letter x.
Flat wagons for road vehicles (Class S…d…) are less common, because this typ of combined transport is only efficient on certain routes.
For the transport of logs, four-axle wagons with non-drivable decks and equipped with high, fixed stanchions are used (Class Snps).
Wagons with a flat deck for transporting assembled track sections, some of which are fitted with special equipment and used in maintenance of way trains, are usually classified as departmental wagons.
Under some circumstances bucket wagons (Kübelwagen) are not classified as open wagons, but grouped into Class S.
The group known as Spreizhaubenwagen (Sins, Sfins) are related to the Sliding wall wagons and, like them are for hygroscopic goods, but have no fixed roof. The sliding walls taper inwards towards the top and are connected by an articulated joint so the walls can be spread and slid apart, so that one half of the wagon is entirely open and may be loaded or unloaded from the side by forklift truck or from above by crane.
Container wagons are flats specially fitted with securing equipment for transporting ISO containers. Depending on their design they may be grouped into classes L, R or S. Class K wagons are rarely used because even an 8-foot (2.438 m) high ISO container exceeds the European loading gauge. The presence of container pins is always indicated by the index letter g. Only general purpose wagons that have to be specially prepared for container transport and have a drivable floor, are classed as standard wagons. Wagons that are exclusively used for container transport are classified as special types. In the latter case, the profile of the wagon underframe is left open and the container only rests on the beams and the trunnions.
Most container flats are designed to take standard 20 and 40 foot ISO containers. Two-axle wagons of this type are able to carry two 20-foot or one 40-foot container; many four-axle wagons have room for three 20-foot or one 40-foot and one 20-foot container.
In India double stacking of containers is done on flat wagons instead of well cars under 7.5m high catenary because the wider Indian Gauge permits more height while keeping the centre of gravity still low. [6]
Car transporters (US: autoracks) are predominantly used for the delivery of factory-new cars and vans to dealers.
Because cars are a relatively light form of freight, European car transporters have two decks and, despite their great length, only need at most three axles. Where there are three axles, the centre one rests on a swivel and the wagon has an articulated joint in the middle. The cars can be loaded over the joint. These wagons are open as a rule and are thus classified as flat wagons of Class L (see above).
Before the development of these specials, standard open wagons were fitted with a second deck, the end walls were removed and pairs of wagons were permanently coupled in order to be used as car transporters. In Germany in the 1950s their capacity proved no longer sufficient for the transport of the VW Beetle. As a result, engineers at Volkswagen and Deutsche Bundesbahn jointly designed an extra long wagon for the transport of factory-new vehicles. The result was a wagon that could carry ten cars from the factory to the ports for export from 1958 onwards.
The car-carrier wagons used in motorail trains are not classed as goods wagons despite their similar design.
A railroad car, railcar, railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck, also called a train car, train wagon, train carriage or train truck, is a vehicle used for the carrying of cargo or passengers on a rail transport network. Such cars, when coupled together and hauled by one or more locomotives, form a train. Alternatively, some passenger cars are self-propelled in which case they may be either single railcars or make up multiple units.
The Bureau International des Containers et du Transport Intermodal oversees standards for intermodal containers, commonly referred to as "shipping containers".
A transporter wagon, in railway terminology, is a wagon (UIC) or railroad car (US) designed to carry other railway equipment. Normally, it is used to transport equipment of a different rail gauge. In most cases, a transporter wagon is a narrower gauge wagon for transporting a wider gauge equipment, allowing freight in a wider gauge wagons to reach destinations on the narrower gauge network without the expense and time of transshipment into a narrower gauge wagons.
A flatcar (US) is a piece of rolling stock that consists of an open, flat deck mounted on a pair of trucks (US) or bogies (UK), one at each end containing four or six wheels. Occasionally, flat cars designed to carry extra heavy or extra large loads are mounted on a pair of bogies under each end. The deck of the car can be wood or steel, and the sides of the deck can include pockets for stakes or tie-down points to secure loads. Flatcars designed for carrying machinery have sliding chain assemblies recessed in the deck.
Rollbocks, sometimes called transporter trailers, are narrow gauge railway trucks or bogies that allow a standard gauge wagon to 'piggyback' on a narrow-gauge line. The Vevey system enables a coupled train of standard gauge wagons to be automatically loaded or rolled onto Rollbocks, so that the train can then continue through a change of gauge.
A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck.
The German term Verbandsbauart describes both a type of goods wagon as well as a type of tram.
Goods wagons or freight wagons, also known as goods carriages, goods trucks, freight carriages or freight trucks, are unpowered railway vehicles that are used for the transportation of cargo. A variety of wagon types are in use to handle different types of goods, but all goods wagons in a regional network typically have standardized couplers and other fittings, such as hoses for air brakes, allowing different wagon types to be assembled into trains. For tracking and identification purposes, goods wagons are generally assigned a unique identifier, typically a UIC wagon number, or in North America, a company reporting mark plus a company specific serial number.
The system of German railway wagon classes (Wagengattungen) was introduced in Germany in 1902 and 1905 by the Prussian state railways based on their system of norms, and was soon taken up by the other state railways (Länderbahnen). On the formation of the Deutsche Reichsbahn, the system became mandatory across the whole of Germany. In the course of the years more and more adjustments to it were made. It was finally replaced between 1964 and 1968 when the two German railway administrations - the Deutsche Bundesbahn and the Deutsche Reichsbahn - adopted the internationally standard UIC classifications for passenger coaches and goods wagons. Today, the system is still regularly being used for narrow gauge goods wagons, because these were not generally given UIC designations, as well as on many historical vehicles.
The so-called Austauschbauart wagons were German railway vehicles produced from the late 1920s onwards which had common components built to agreed standards.
Open wagons form a large group of railway goods wagons designed primarily for the transportation of bulk goods that are not moisture-retentive and can usually be tipped, dumped or shovelled. The International Union of Railways (UIC) distinguishes between ordinary wagons and special wagons (F/6). Open wagons often form a significant part of a railway company's goods wagon fleet; for example, forming just under 40% of the Deutsche Bahn's total goods wagon stock in Germany.
A covered goods wagon or covered goods van is a railway goods wagon which is designed for the transportation of moisture-susceptible goods and therefore fully enclosed by sides and a fixed roof. They are often referred to simply as covered wagons, and this is the term used by the International Union of Railways (UIC). Since the introduction of the international classification for goods wagons by the UIC in the 1960s a distinction has been drawn between ordinary and special covered wagons. Other types of wagon, such as refrigerated vans and goods wagons with opening roofs, are closely related to covered wagons from a design point of view. Similar freight cars in North America are called boxcars.
The International Union of Railways groups all special classes of railway goods wagon into Class U in its goods wagon classification system.
The fleet of Great Western Railway wagons was both large and varied as it carried the wide variety of goods traffic on the Great Western Railway (GWR) in the United Kingdom. This was the railway company that operated for the longest period of time in the country and covered a large geographical area that included big cities such as London, industrialised areas including the West Midlands, areas of coal and mineral mining such as South Wales, and Somerset and other important agricultural districts. In 1902 the company owned 59,036 wagons, and by 1926 this had risen to 88,580.
Double-stack rail transport is a form of intermodal freight transport in which railroad cars carry two layers of intermodal containers. Invented in the United States in 1984, it is now being used for nearly seventy percent of United States intermodal shipments. Using double stack technology, a freight train of a given length can carry roughly twice as many containers, sharply reducing transport costs per container. On United States railroads special well cars are used for double-stack shipment to reduce the needed vertical clearance and to lower the center of gravity of a loaded car. In addition, the well car design reduces damage in transit and provides greater cargo security by cradling the lower containers so their doors cannot be opened. A succession of larger container sizes have been introduced to further increase shipping productivity in the United States.
The wagon with opening roof is a type of railway goods wagon that is, nowadays, defined and standardised by the International Union of Railways (UIC) as Class "T". They are a large category of rail vehicle, predominantly used for the transport of hygroscopic bulk commodities such as cement, plaster, lime, potash and grain.
The Victorian Railways used a variety of flat wagons for the transport of a wide range of loads. Generally speaking, the bogie wagons were custom-built for the job, while the fixed-wheel variants were cut down from former open wagons. Loadings would be placed on the deck and, if necessary, protected with tarps, then secured to the wagons with chains or rope connecting to lashing rings along the side of the wagon frames.
The Victorian Railways used a variety of former traffic wagons around depots and for specific construction, maintenance and similar tasks. Very few of these vehicles were specially constructed from scratch, often instead recycling components or whole wagon bodies and frames from old vehicles that had been withdrawn from normal service as life-expired or superseded by a better design.
A pocket wagon is a freight wagon that has been specially designed for the transport of truck semi-trailers. This wagon belongs to the group of flat wagons in special design with bogies and is used in combined transport (CT). The name of these freight wagons comes from the fact that between the narrow longitudinal girders on the outside and also lengthways between the bogies, the so-called pockets are located, in which the wheels of the semi-trailers are particularly low. For flexible use in CT, pocket wagons have hinged latches with ISO spigots on the solebar, so that containers and swap bodies up to 45 ft can be accommodated. As a flat wagon, it bears the UIC generic letter S and, since it is intended for the transport of road vehicles on one level, the code letter d. Since it is also possible to transport containers in a pocket wagon, it bears the UIC generic mark Sdgs. In this context, the code letter g stands for "containers up to 60 feet" and the lower case s for the permitted speed of up to 100 km/h (62 mph). The wagons have a yellow triangle with a black P on the long side. The first pocket wagons were built in Germany as early as 1972 and further developed according to requirements.
The kangourou wagon is a type of rail wagon designed for the transport of semi-trailers. It has a drawbridge forming a pocket in the low position allowing the carrier train of the semi-trailer to be placed and thus to respect the height of the loading gauge.