The Forney locomotive is a type of tank locomotive patented by Matthias N. Forney between 1861 and 1864 and used predominantly in the US.
The Forney locomotive is a type of tank locomotive patented by Matthias N. Forney between 1861 and 1864 and used predominantly in the US.
Forney locomotives include the following characteristics:
The locomotives were set up to run cab (or bunker) first, effectively as a 4-4-0 (or 6-4-0), though the type achieved popularity for its ability to operate well in either direction. The 4-4-0 wheel arrangement, with its three-point suspension, was noted for its good tracking ability, while the flangeless middle wheels allowed the locomotive to round tight curves. Placing the fuel and water over the truck rather than the driving wheels meant the locos had a constant adhesive weight, something other forms of tank locomotive did not.
Large numbers of Forney locos were built for the surface and elevated commuter railroads that were built in cities such as New York, Chicago and Boston. These railroads required a small, fast locomotive that tracked well and could deal with tight curves. Their short runs meant the limited fuel and water capacity was not a problem, making the Forney ideal. However, their noise, smoke and tendency to drop ash and cinders (particularly from overhead tracks) made them unpopular. As these railroads began to electrify or were replaced by subways at the end of the 19th century, Forneys began to disappear.
Forneys were also popular on the 2 ft (610 mm) narrow gauge railroads of Maine. The use of these locomotives differed in that they were run smokestack leading, like a conventional locomotive, and all driving wheels were flanged. The latter resulted in Maine narrow gauge railroads having comparatively broad radius curves. Further developments included the introduction of locomotives with a leading pony truck, giving a 2-4-4 wheel arrangement. This was done to improve tracking ability in these locomotives.
The 0-4-4 RT type was a precursor of other designs which may have drawn on the Forney, such as the Boston & Albany and Central of New Jersey 4-6-4 T .[ citation needed ]
The Mason Locomotive Works, developed the Mason Bogie locomotive, a type of British Single Fairlie. Unlike the Forneys, the Mason Bogies were articulated locomotives: the boiler and fuel/water tank were on the main frame and the engine was on a separate steam "bogie" that was articulated to pivot beneath the boiler. Because the bogie was articulated, the reach rod and reversing lever were positioned above the main frame earning the locomotives the nickname "sewing machines."[ citation needed ]
Today, Forney locomotives can still be seen on Maine Narrow Gauge Railroad Museum and at the Forney Transportation Museum. The No. 3 and No. 5 locomotives on the Disneyland Railroad were originally built as Forneys, but are now 2-4-4 RT Boston-type locomotives. [1] [2]
A bogie is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles. Bogies take various forms in various modes of transport. A bogie may remain normally attached or be quickly detachable. It may include a suspension component within it, or be solid and in turn be suspended ; it may be mounted on a swivel, as traditionally on a railway carriage or locomotive, additionally jointed and sprung, or held in place by other means.
Mason Bogie locomotives are a type of articulated tank locomotive suited for sharp curves and uneven track, once commonly used on narrow-gauge railways in the United States. The design is a development of the Single Fairlie locomotive.
A Fairlie locomotive is a type of articulated steam locomotive that has the driving wheels on bogies. The locomotive may be double-ended or single ended. Fairlies are most famously associated with the Ffestiniog Railway in North Wales.
A tank locomotive or tank engine is a steam locomotive that carries its water in one or more on-board water tanks, instead of a more traditional tender. Most tank engines also have bunkers to hold fuel; in a tender-tank locomotive a tender holds some or all of the fuel, and may hold some water also.
Under the Whyte notation for the classification of steam locomotives, a 2-10-4 locomotive has two leading wheels on one axle, usually in a Bissel truck, ten coupled driving wheels on five axles, and four trailing wheels on two axles, usually in a bogie. These were referred to as the Texas type in most of the United States, the Colorado type on the Burlington Route, and the Selkirk type in Canada.
Main components found on a typical steam locomotive include:
Under the Whyte notation for the classification of steam locomotives, 4-2-0 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle and no trailing wheels. This type of locomotive is often called a Jervis type, the name of the original designer.
Under the Whyte notation for the classification of steam locomotives, 0-10-2 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle.
Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-4-4 is a steam locomotive with two unpowered leading wheels followed by four powered driving wheels and four unpowered trailing wheels. This configuration was only used for tank locomotives; no tender locomotives with this wheel arrangement were made.
Under the Whyte notation for the classification of steam locomotives, 4-2-4 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and four trailing wheels on two axles.
Under the Whyte notation for the classification of steam locomotives, 0-4-4 represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles. This type was only used for tank locomotives.
A Meyer locomotive is a type of articulated locomotive that has two separate bogies, upon which the boiler and firebox swivel. The design was never as popular as the Garratt or Mallet locomotives. It can be best regarded as 19th Century competition for the early compound Mallet and also the Fairlie articulated designs. Most single cab modern trains are of a similar design such as power cars, freight diesel locomotives, and some passenger locomotives.
In the Whyte notation for describing steam locomotive wheel arrangement, a 2-6-6 is a locomotive with a two-wheeled leading truck, six driving wheels, and a six-wheeled trailing truck. All the locomotives produced of this arrangement have been tank locomotives, and the vast majority in the United States. It was a popular arrangement for the larger Mason Bogies, as well as some of the largest suburban tank locomotives.
In the Whyte notation for describing steam locomotive wheel arrangement, a 2-8-6 is a locomotive with a two-wheel leading truck, eight driving wheels, and a six-wheel trailing truck. All 2-8-6 locomotives constructed have been Mason Bogie tank locomotives.
Under the Whyte notation for the classification of steam locomotives, 2-6-0+0-6-2 represents the wheel arrangement of an articulated locomotive with two separate swivelling engine units, arranged back to back with the boiler and cab suspended between them. Each engine unit has two leading wheels in a leading truck, six powered and coupled driving wheels on three axles and no trailing wheels.
A lateral motion device is a mechanism used in some railroad locomotives which permits the axles to move sideways relative to the frame. The device facilitates cornering.
In Whyte notation, a 2-4-6 is a steam locomotive with two unpowered leading wheels followed by four powered driving wheels and six unpowered trailing wheels. This wheel arrangement was only used for tank locomotives; no 2-4-6 tender locomotives were made.
The South African Railways Class FC 2-6-2+2-6-2 of 1925 was an articulated steam locomotive.
The South African Railways Dutton road-rail tractors of 1923 were road-rail steam tractors.
Under the Whyte notation for the classification of steam locomotives, 0-6-6 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles and six trailing wheels on three axles. All locomotives with this wheel arrangement were tank locomotives; no 0-6-6 tender locomotives were recorded.
