William K. MacCurdy

Last updated
William K. MacCurdy
Nationality American
Scientific career
Institutions SRI International
Evans Products Company

William K. MacCurdy was an American engineer at SRI International that developed the Hydra-Cushion freight car for Southern Pacific in 1954. Cushioned rail cars based on his design are still the standard. [1] [2] [3]

Contents

Career

MacCurdy joined SRI International in 1952 with a background in shipbuilding; he was previously a naval architect. [1] Donald J. Russell connected Southern Pacific with SRI in 1954, and asked them to design a new rail coupling; in particular, Southern Pacific was concerned with the draft gear, the part that connects the couplings to the rolling stock. [1] [4] In MacCurdy's design, the coupler has an extended connection to the center of the railway car, combined with interleaved fingers at each end of the railway car helping to absorb some of the effects of acceleration. [1]

The theory was tested in December 1954 by modifying an existing car with the technology (initially known as the "Hydra-friction") in Sacramento and placing it into relatively difficult service; the car greatly exceeded expectations. [1] The second iteration, bearing the more widely known name of Hydra-Cushion, was introduced in April 1956, and Southern Pacific built and deployed an additional 350 of these cars in summer 1957. [1] The average damage to freight was reduced to 1/25th of previous values. [1] [5] [6]

MacCurdy left SRI to be the chief research engineer in the Transportation Equipment Division of Evans Products Company, which was licensed some of the proprietary information about the Hydra-Cushion from Southern Pacific in 1957. [1] [7]

Legacy

In 1964, MacCurdy and Southern Pacific's William E. Thomford received the Franklin Institute's 1964 George R. Henderson Medal for achievements "in the field of railway impact control and associated car design, with resulting benefits in reducing lading and rolling stock damage". [1] [8] [9] In 1967, Railway Age noted that "The 10th anniversary of the cushion-underframe... has to be one of the most significant anniversaries in the annals of the industry." [1] [4]

Related Research Articles

Caboose Crew car on the end of trains

A caboose is a crewed North American railroad car coupled at the end of a freight train. Cabooses provide shelter for crew at the end of a train, who were formerly required in switching and shunting, keeping a lookout for load shifting, damage to equipment and cargo, and overheating axles.

Association of American Railroads Industry trade group representing major North American freight railroads

The Association of American Railroads (AAR) is an industry trade group representing primarily the major freight railroads of North America. Amtrak and some regional commuter railroads are also members. Smaller freight railroads are typically represented by the American Short Line and Regional Railroad Association (ASLRRA), although some smaller railroads and railroad holding companies are also members of the AAR. The AAR also has two associate programs, and most associates are suppliers to the railroad industry.

Stock car (rail) Rolling stock used for carrying livestock on railways

In railroad terminology, a stock car, cattle car, cattle truck or cattle wagon is a type of rolling stock used for carrying livestock to market. A traditional stock car resembles a boxcar with louvered instead of solid car sides for the purpose of providing ventilation; stock cars can be single-level for large animals such as cattle or horses, or they can have two or three levels for smaller animals such as sheep, pigs, and poultry. Specialized types of stock cars have been built to haul live fish and shellfish and circus animals such as camels and elephants. Until the 1880s, when the Mather Stock Car Company and others introduced "more humane" stock cars, death rates could be quite high as the animals were hauled over long distances. Improved technology and faster shipping times have greatly reduced deaths.

Railway coupling Mechanism for connecting rolling stock in a train

A coupling is a mechanism used to connect rolling stock together in a train.

Tank car Rolling stock designed to transport liquid and gaseous commodities

A tank car is a type of railroad car or rolling stock designed to transport liquid and gaseous commodities.

Crane (rail) Type of crane used on a railroad

A railroad crane is a type of crane used on a railroad for one of three primary purposes: freight handling in goods yards, permanent way (PW) maintenance, and accident recovery work. Although the design differs according to the type of work, the basic configuration is similar in all cases: a rotating crane body is mounted on a sturdy chassis fitted with flanged wheels. The body supports the jib and provides all the lifting and operating mechanisms; on larger cranes, an operator's cabin is usually provided. The chassis is fitted with buffing (UK) and/or coupling gear to allow the crane to be moved by a locomotive, although many are also self-propelled to allow limited movement about a work site.

The St. Louis Car Company was a major United States manufacturer of railroad passenger cars, streetcars, trolleybuses and locomotives that existed from 1887 to 1974, based in St. Louis, Missouri.

Rail yard Enclosed area designated for railways

A rail yard, railway yard, or railroad yard is a complex series of railroad tracks for storing, sorting, or loading and unloading railroad cars and locomotives. Railroad yards have many tracks in parallel for keeping rolling stock or unused locomotives stored off the mainline, so that they do not obstruct the flow of traffic. Railroad cars are moved around by specially designed yard switchers, a type of locomotive. Cars in a railroad yard may be sorted by numerous categories, including railway company, loaded or unloaded, destination, car type, or whether they need repairs. Railroad yards are normally built where there is a need to store cars while they are not being loaded or unloaded, or are waiting to be assembled into trains. Large yards may have a tower to control operations.

Canadian Car and Foundry Transportation vehicle manufacturer in Canada, 1909-1980s

Canadian Car and Foundry (CC&F), also variously known as "Canadian Car & Foundry" or more familiarly as "Can Car", was a manufacturer of buses, railway rolling stock, forestry equipment, and later aircraft for the Canadian market. CC&F history goes back to 1897, but the main company was established in 1909 from an amalgamation of several companies and later became part of Hawker Siddeley Canada through the purchase by A.V. Roe Canada in 1957. Today the remaining factories are part of Bombardier Transportation Canada.

Rail transportation in the United States Overview of rail transportation in the United States

Rail transportation in the United States consists primarily of freight shipments, with a well integrated network of standard gauge private freight railroads extending into Canada and Mexico. Passenger service is mainly mass transit and commuter rail in major cities. Intercity passenger service, once a large and vital part of the nation's passenger transportation network, plays a limited role as compared to transportation patterns in many other countries. The United States has the largest rail transport network size of any country in the world.

Shunting, in railway operations, is the process of sorting items of rolling stock into complete trains, or the reverse. In the United States this activity is known as switching.

British Rail Class 415 British Rail coaching stock

British Rail Class 415 was a suburban 750 V DC third rail electric multiple unit commissioned by the Southern Region of British Railways. Built between 1951 and 1957, it became the most numerous class on the region after the withdrawal of the 4SUBs. The final trains were withdrawn in the 1990s, replaced by Class 455, 456, 465 and 466.

Coil car Type of rolling stock

Coil cars are a specialized type of rolling stock designed for the transport of coils of sheet metal, particularly steel. They are considered a subtype of the gondola car, though they bear little resemblance to a typical gondola.

SA3 coupler

SA3 couplers are railway rollingstock couplings used primarily in Russia and states influenced by the former Soviet Union, such as Finland and Mongolia.

Donald J. Russell

Donald Joseph McKay Russell was an American railroad executive. He was president of Southern Pacific Railroad from 1952–1964 and then chairman from 1964–1972. Russell was featured on the cover of Time on August 11, 1961 and Forbes on November 1, 1965.

Janney coupler Semi-automatic railroad coupler

Janney couplers are a semi-automatic form of railway coupling that allow rail cars and locomotives to be securely linked together without rail workers having to get between the vehicles. They are also known as American, AAR, APT, ARA, MCB, knuckle, or center-buffer couplers.

The George R. Henderson Medal was an award established by the Franklin Institute in honor of George R. Henderson in 1924, coinciding with a $2,500 fund for the award contributed by his wife. George R. Henderson served on the Franklin Institute's Committee on Science and the Arts from 1912 until 1921. The award was designated to go to individuals who made significant contributions to railroad engineering.

Thomas H. Morrin was an engineer and the director of engineering at SRI International from 1948 to 1963.

Dual coupling

Different types of railroad rolling stock have different couplers depending on the purpose and type of equipment being used and its intended destination. European rolling stock tend to use buffers and chain couplers while American rolling stock uses a Janney coupler or "knuckle coupler". These are incompatible with each other, but where some railroads have obtained older, less expensive used rolling stock from different countries or regions, instead of having to standardize on one form of coupler, it may be useful to be able to use either type of coupler on a piece of rolling stock without having to remove anything.

References

  1. 1 2 3 4 5 6 7 8 9 10 Nielson, Donald (2006). A Heritage of Innovation: SRI's First Half Century. Menlo Park, California: SRI International. pp. 6-1–6-3. ISBN   978-0-9745208-1-0.
  2. Inventor William K. MacCurdy. "Direct-Acting Hydraulic Pneumatic Device". United States Patent and Trademark Office . Retrieved 2012-04-01.
  3. Impact tests of cushion underframes and hydrafriction and standard draft gears. Stanford Research Institute. 1955.
  4. 1 2 "Era of car cushioning began 10 years ago". Railway Age . 1967-02-27. pp. 34–35.
  5. "Softer Rides for Rail Freight". SRI Journal. 2 (2). 1958. pp. 44–45.
  6. "Railroad Hydra-Cushion". Timeline of Innovations. SRI International . Retrieved 2013-07-01.
  7. Modern railroads. 20. 1965. p. 166.
  8. "A Research Accomplishment Acknowledged". SRI International. 1964.
  9. "Train Museum News" (PDF). Millbrae Life & Times. Millbrae Historical Society. June 2008. Retrieved 2012-04-01.