Question: Are steam locomotives more powerful than diesel?

Dieselisation



Dieselisation or dieselization  is a term generally used for the increasingly common use of diesel fuel in vehicles as opposed to gasoline or steam engines. The term is commonly used to refer to the replacement of steam locomotives by diesel locomotives and multiple units from the 1930s to the 1960s.
Road transport

Europe
In terms of road transport, diesel gained popularity first with commercial hauliers, throughout the later 20th century, and then with passenger car users, particularly from the 1970s onwards, once diesel engines became more refined and also more readily available in passenger cars. Diesel had by this point long been a popular choice for taxi operators and agricultural users.
In Europe as a whole, Peugeot and Mercedes-Benz in particular developed reputations for passenger-car diesel engines, whilst VM Motori developed some significant motors for four-wheel drive vehicles.
In London the famed "Hackney Carriage" taxi has long since been powered by a diesel engine. The high reliability, ease of driveability and excellent fuel efficiency of such an engine allows the taxis to carry many people for a lower cost than might otherwise be incurred through the use of conventional petrol engines.
Water transport
The two-stroke marine diesel engine was introduced in 1922 and remains in use today.  It is the most efficient prime mover, with models over 100,000 horsepower and a thermal efficiency of 50%.[1]  The market share of steam ships peaked around 1925 (a few sailing ships remained) and by the early 1950s diesel ships held over 50% of the market.[2]
Rail transport
In rail transport, dieselisation refers to the replacement of the steam locomotive or electric locomotive with the diesel-electric locomotive (often referred to as a "diesel locomotive"), a process which began in the 1930s and is now substantially complete around the world.
The replacement of either steam or diesel haulage with electric locomotives is known as electrification. Whereas the benefit of replacing steam traction is indisputable, there is some dispute as to whether it is best replaced by dieselisation or electrification. Electrification has a high initial capital cost but the operating costs are lower. The overall savings depend on the effect of the investment cost compared with the savings due to lower operational and maintenance costs and the influence of better acceleration and tractive effort on railroad throughput. These are obviously different for e.g. urban networks and very long-distance networks with low frequencies. However, many railway commentators are increasingly suggesting that the ability of railways to operate with electricity not produced from fossil fuels may offer a decisive advantage over diesel power.
Advantages of diesel in rail transport

Dieselisation took place largely because of the tremendous reduction in operating costs it allowed. Steam locomotives require large pools of labour to clean, load, maintain and run. They also require extensive service, coaling and watering facilities. This was their biggest inferior measure as compared to the diesel locomotive in the number of ton-miles or passenger traffic miles either could run.  Diesels could and did have a significantly higher initial price per unit-horsepower delivered.  However, their far greater range between fueling stops, the absence of water stops, and the much higher unit availability between inspection repair and maintenance stops, were far better than steam.  Diesels simply required significantly less time and labour to operate and maintain.  Diesel power was also more scalable to power requirements, owing to the control systems that allowed multiple units to be controlled by one operator.  "Double header" steam power required a crew for each locomotive.  Initially, diesel locomotives were less powerful than the typical steam locomotives.  Between the late 1930s and the late 1950s the power available with diesel locomotive engines roughly doubled, although the most powerful steam locomotives ever built still exceeded the power of the most powerful diesel locomotives from the late Twentieth Century.
Timeline by nation
Europe
As the rail lines in Europe are primarily designed for moving passenger (as opposed to freight) the trend in Europe was to replace steam traction in the main lines with electric traction, with the exceptions of the United Kingdom, Ireland and Albania. Diesels were used as an interim solution during electrification and as a permanent solution for secondary lines with less traffic and as switchers. Electrification is nowadays widespread in Europe. As of 2015, the railways in Albania and Ireland (with the exception of the electrified Dublin Area Rapid Transit) remain entirely diesel operated. Even in sparsely populated large countries (Finland, Sweden) electrification has proven to be more economical than diesels. Some countries, most notably Switzerland, have electrified their whole network.
United Kingdom
The Great Western Railway introduced diesel railcars in the 1930s and the first British mainline diesel locomotive was built by the London, Midland and Scottish Railway in 1947 but, unlike elsewhere in the developed world, the transition away from steam was delayed during the early postwar years.  The delay was driven by two economic considerations: the lower initial cost of steam locomotives for immediate replacement of the large number of locomotives worn out from wartime service, and a projected rise in the cost of petroleum relative to coal, a plentiful domestic resource.  Nationalisation of the railways took place in 1948; diesel locomotives were first introduced on a wide scale following the Modernisation Plan of 1955.  Poor reliability among the first diesel locomotives used in the Modernisation Plan caused it to be implemented at a slower pace while the problems with the locomotives were worked out during the second half of the 1950s.[3]
The last steam locomotive for British Rail was built in 1960 and named "Evening Star" (number 92220). Steam traction was withdrawn on British Rail in 1968 and largely replaced with diesel traction (with electrification on a minority of lines). Steam was finally eliminated on Northern Ireland Railways in 1970 and entirely replaced with diesel. Steam locomotives purchased from the Great Western Railway were utilized by London's Metropolitan lines for suburban traffic until 1971. Similar tank engines remained in minor industrial use into the early 1980s.
North America
The small initial market for diesels was created by the State of New York's Kaufman Act of 1923, which prohibited operating steam locomotives in New York City and adjacent towns. Mainline passenger railroads had already been electrified, or their electrification had been planned regardless of the Kaufman Act. Electrification of numerous freight yards was uneconomical, and railroads turned to diesels. The first ALCO boxcab switcher was put in operation in 1925 by Central Railroad of New Jersey at its 138th Street[4] waterfront terminal in The Bronx.[5] The second was delivered in the same year to Baltimore and Ohio Railroad's yards on Manhattan. Both worked into the late 1950s and survive in museums to date.[6] The advantages of diesel-electric switch engines gained them a widespread market during the 1930s.
Dieselization got a boost in the early 1930s from three factors: the development by General Motors and its Winton Engine Corporation subsidiary of diesel engines with vastly improved power-to-weight ratios and output flexibility; the desire of railways to find more cost-efficient locomotion for passenger service at the height of the Great Depression; and design innovations in rail equipment that reduced weight, making the contemporary diesel engines, which were low-powered by today's standards, viable for mainline passenger service.  The mid-1930s saw the introduction of lightweight diesel-powered streamlined trainsets such as the Burlington Route's Zephyrs and Union Pacific's M-1000x "City" trains, which were diesel's first assault against the dominance of steam in mainline passenger service.  During the second half of the decade, diesel locomotives with sufficient power for full-size passenger trains were developed and put into regular production. Improved GM diesel engines in 1938 increased power and reliability. Dieselization of passenger service gained momentum as the decade drew to a close and the first model of mainline diesel freight locomotive was on the market in 1940.  Dieselization was especially attractive to western railroads, for whom the watering requirements of steam locomotives were a problem in vast stretches of the western interior.  Coal-country railroads were generally reluctant to embrace diesel, a competitor to one of their main hauling markets, well into the 1940s.
Competition from diesel spurred a round of development in steam locomotive technology. High style, high speed "steamliners" produced during the second half of the 1930s became the speed kings of passenger service. Duplex and articulated steam locomotives built in the early 1940s exceeded the power of any diesel ever built, although their power was edged by gas turbine-electric locomotives during the 1950s.  But the limits of steam technology were rapidly being reached.  The new locomotives were mechanically complex and extremely specialized.  Locomotive size became an issue, as steam engines became so big in the 1940s that the cylinder and boiler dimensions were pushing the limits that the loading gauge would allow. Fireboxes became so big that firing a steam locomotive became an extremely difficult job without the aid of mechanical stokers.  Mechanical stokers for feeding coal to locomotives were in use in the 1920s.[7]  Steam turbine-electric locomotive power was developed in 1938 by General Electric.  GE abandoned the project in 1943 after results were unsatisfactory during trials with three railroads, however, Baldwin Locomotive Works built three steam turbine-electric locomotives in 1948.  They were expensive to operate and insufficiently reliable for their intended service, and were scrapped in 1950.  Baldwin's steam turbine-electric program resulted in one more locomotive in 1954, which was also not successful in service.
Weighing against the cost of, and inertia against, replacing the large investment that railroads had in existing steam power were the dramatic increases in flexibility and efficiency with diesel.  The fastest and most powerful steam locomotives were faster and more powerful than diesels; however, their range of efficient operation was severely limited.  Diesels pro-rate their fuel usage to the length of trains, which a steam engine cannot do.  Multiple-unit diesel power is scalable to power requirements with one locomotive crew; steam power is not.  A high speed Hudson steam locomotive is good for only one situation, high speeds on level grades.  The diesel locomotive can be operated by a single person, with no need of a fireman to run the boiler (two person cab crews may be required for other reasons). Also, diesels use much less fuel and no manpower when idling, something locomotives often do. Diesels can be parked running for days unattended, whereas steam engines must be constantly tended to if not completely shut down.  Bringing a steam engine boiler up to operating temperature is often regarded as both an art and science, requiring much training and experience. A diesel is much simpler to start and shut down.
US entry into World War II interrupted dieselization.  The US Navy gained priority for diesel engines, curtailing their availability for railway use.  No production of passenger locomotives was permitted by the War Production Board between September 1942 and February 1945.  The petroleum crisis of 1942-43 made coal-fired steam more attractive, especially near the east coast.  After the peak of the petroleum crisis and as wartime production of diesel engines hit its stride, increasing production of freight diesel locomotives was permitted.  By the war's end, pent-up demand to replace dated and worn-out railway equipment was overwhelming.  General Motors signed proprietary contracts with the major railroads, who were replacing their worn out wartime equipment with diesels. With the GM contracts came articles that GM would supply training, financing, and maintenance, to lower the hurdles in converting from steam to diesel.
The market share of steam locomotives dropped from 30% in 1945 to 2% in 1948.[8]  The drop was most precipitous in passenger service, where modernization of equipment was imperative for image and cost reasons.  Retired equipment pressed into service during the war years left a lasting impression on millions of servicemen who sometimes spent extended periods in obsolete, uncomfortable cars in obscure locations. Railroads were facing increasingly stiff competition for passenger service from airplanes and the automobile and the cost-cutting imperatives with passenger service were severe.  Steam holdout Norfolk and Western acquired the last American steam locomotives built, a piston locomotive built in their own shop in 1953 and a steam turbine-electric locomotive built by Baldwin Locomotive Works in 1954.[9]
Due to the advantages of diesel locomotives, railroads in North America had retired 90% of their steam locomotives by the mid-1950s.[10][11][12]  Also, major cities and their railyards became unhappy neighbors in post-war America. People were no longer content to endure the large amounts of soot and smoke that coal burning steam engines produced. Early diesels, while dirty by today's standards, were a gigantic improvement in air pollution over steam.
Steam engines lasted well into the late 1950s on major American railroads, and in isolated cases into the middle 1960s on small common carrier roads, primarily for yard duties such as switching. The last steam locomotive fleet in everyday use (i.e. not a restored fleet) was retired in the late 1970s. Now they are only found in historical and sightseeing roles, where the steam engine is once again the star of the show. Retired steam engines, many of which were quite new when made obsolete, often found a second life in developing nations due to their cheap labor for maintenance and crewing, ready supplies of coal, and lack of environmental concern.
United States
This list is a sample of some of the more prominent railroad companies' diesel traction conversions. 
Aberdeen and Rockfish Railroad - last steam locomotive retired in 1953
Akron, Canton and Youngstown Railway - steam era ended in 1955
Alabama, Tennessee & Northern - steam ended in 1952
Alaska Railroad - last steamer, former USATC S160 2-8-0 #557 retired in 1964, making the ARR one of the last railroads in the U.S. to dieselise
Alton and Southern Railway - a Union Pacific subsidiary, steam operations ended in 1950
Ann Arbor Railroad - dieselised by 1952
Atchison, Topeka, and Santa Fe Railroad - the last revenue steam operations occurred on August 27, 1957.[13] Dieselisation completed in 1959.
Atlanta & West Point - last steam locomotives retired in 1954.
Atlantic and Yadkin Railway - a small shortline operated independently by the Southern Railway from 1917 until it merged with the Southern in 1950, that was the last time a steam locomotive ran on the line.
Atlantic Coast Line - dieselisation by 1954.
Baltimore and Ohio Railroad - first diesel purchased in 1928. Dieselisation completed in April 1960 when the EM-1 2-8-8-4s dropped their fires for the last time.
Bangor and Aroostook Railroad - steam traffic ended in 1953
Bessemer and Lake Erie Railroad - dieselisation complete in 1954
Boston and Maine Railroad - end of steam in 1956.
Buffalo Creek and Gauley Railroad - last steam engine, 2-8-0 #4, ran on February 27, 1965.[14]
Cadiz Railroad - Last steam locomotive to run on the line was 0-6-0 #205 on July 25th, 1954.
Carolina & Northwestern - a separately controlled company run by the Southern Railway; steam gone by 1948
Central of Georgia - steam fleet retired in 1953, but 4-4-0 #349 and 4-6-0 #403 were still leased to the Talbotton Railroad at the time. #403 retired in 1957 and #349 was kept around on stand-by until 1961.
Central of New Jersey - steam fleet retired in 1954
Central Vermont - steam fleet retired by 1957
Chesapeake and Ohio Railroad - dieselisation completed in 1957, however the railroad's fireless cookers continued service until 1965.
Chattahoochee Valley Railway - By 1947, Baldwin 2-8-0 #21 became the last steam locomotive on the CHVRR. It was kept on stand-by and flood relieve service until it retired from service in 1961.
Chicago and Alton Railroad - dieselisation completed in 1952
Chicago & Eastern Illinois - last steam in 1955
Chicago & Illinois Midland - last steam locomotive retired in 1955
Chicago & North Western - steam ended in 1956
Chicago, Burlington and Quincy Railroad - first diesel 1934;[15] dieselisation completed in 1960 (but see Colorado & Southern, below)[16]
Chicago, Peoria and St. Louis Railway - steam operations ended in 1952
Chicago, Rock Island and Pacific Railroad - official dieselisation date was September 16, 1953[17]
Clinchfield Railroad - steam phased out in 1954
Colorado and Southern Railway - dieselisation completed with 2-8-0 #641 running her last train on October 11, 1962[16]
Crab Orchard and Egyptian Railway - steam-using tourist line that added regular revenue freight service in 1977, dieselised in 1986.[18] Recognized by the AAR as the last US railroad of any kind to use steam locomotives in regular revenue service.
Danville and Western Railroad - dieselization completed in the early 1950.
Delaware and Hudson Railway - last steam in 1953
Delaware, Lackawanna, and Western Railroad - dieselisation completed by 1953.
Denver and Rio Grande Western Railroad - Standard gauge lines completed dieselisation in September 1956; narrow gauge lines ended revenue operation on August 31, 1968, never dieselizing.
Detroit and Mackinac Railroad - this line dieselised early, retiring the last of its steam locomotives in 1948
Detroit, Toledo & Ironton - steam ended in 1955
Duluth and Northeastern Railroad - dieselized in 1964
Duluth, Missabe & Iron Range - steam operations finished by 1962
Duluth, South Shore & Atlantic - last steam locomotives written off the active roster in 1953
East Tennessee & Western North Carolina - narrow gauge lines went down on October 16, 1950, never dieselising. Standard gauge steam went on for another 17 years until the Southern Railway traded two Rs-3s for the ET&WNC's last steam locomotives on December 8, 1967. Last steam locomotives to run in revenue service in Tennessee.
Elgin, Joliet and Eastern Railway - first diesel 1937;[19] dieselisation completed in May 1949 [20][21]
Erie Railroad - Steam phased out on March 17, 1954.
Florida East Coast Railway - last steam locomotives removed from service in 1955
Fort Worth and Denver Railroad - last steam locomotives retired in 1960
Frisco Railway - steam fleet retired in 1952, however 46 steam locomotives were still kept on the active roster until August 1956.
Georgia, Ashburn, Sylvester and Camilla Railway - The railway ran steam until 1948[22].
Georgia & Florida Railway - last steam locomotives retired by 1953
Georgia Northern Railway - steam phased out in 1962
Georgia Railroad - dieselised in 1955
Grand Trunk Western Railway - one of the last railways in the US to dieselize; retired its last steam locomotives in 1961.
Great Northern Railway - dieselisation completed in 1958
Green Bay & Western - last steam locomotives delivered new in 1939; steam officially gone by the end of 1953
Great Western Railway - steam used at least to 1965, possibly 1967
Great Western Sugar Company - last steam operation in 1983; among the last industrial steam users in the US
Gulf, Mobile, and Ohio Railroad - steam phased out by 1951
Hampton and Branchville Railroad - steam operations ended in 1958.
Illinois Central Railroad - dieselisation completed in 1960
Interstate Railroad - last steam locomotive retired in 1955.
Kansas City Southern Railroad - dieselization completed by 1954
"The Katy" - steam fleet retired in 1951
Kentucky and Tennessee Railway - The railroad was run by steam until the road purchased 3 S-2 diesel switchers from the D&RGW in February 1964.
Lake Superior and Ishpeming Railroad - dieselised in 1962
Lehigh and Hudson River Railway - dieselised in 1950
Lehigh Valley Railway - steam fleet retired in 1951
Litchfield and Madison Railway - last steam operation in 1954
Live Oak, Perry & Gulf - steam phased out by 1955
Long Island Railroad - last steam, ex-PRR locomotives, ran in late 1955
Louisiana & Arkansas - last steam locomotives retired in 1954
Louisville and Nashville Railroad - last steam locomotives dropped off the roster in November 1956, although 2-8-2 #1882 kept running on a branch line in Kentucky until 1957
Magma Arizona Railroad - last steam locomotive retired from revenue service on September 4, 1968
Maine Central Railroad - last steam locomotives retired in 1954
McCloud River Railroad - last steam locomotives retired in 1956
Milwaukee Road - last new steam 1944; dieselisation completed in 1957
Minneapolis and St. Louis Railway - last steam locomotive retired in 1951
Minneapolis, Northfield & Southern - dieselised by 1953
Mississippi Central Railroad - steam era ended in 1953
Missouri Pacific Railroad - the last steam locomotives retired in November 1955.[23]
Monon Railroad - dieselisation completed in 1949
Monongahela Railroad - last steam on the line in 1954.
Morehead & North Fork Railroad - dieselization completed on April 1st, 1963.
Moscow, Camden and San Augustine Railroad - Last steam run was January 1965.
Nashville, Chattanooga & St. Louis - last steam operations on September 2, 1953
Nevada Northern Railroad - last steam locomotive ran in 1961
New Haven Railroad - dieselization completed in 1952, spurred on by steam restrictions in the vicinity of New York City
New York Central Railroad - full-scale dieselization began in the late 1940s; final run of steam in regular service was in 1957[24]
New York, Susquehanna and Western Railway - perhaps the first major railroad to dieselize, the "Susie-Q" had eliminated all of its steam locomotives in 1945.
Nickel Plate Road - one of the last holdouts of the steam locomotive in America, retiring the last of its steam fleet in 1960
Norfolk and Western Railway - last new steam in late 1953; marking the last US Class 1 railroad to dieselize; dieselisation completed on May 7, 1960.[9] However, some sources state that many Y series 2-8-8-2s were kept around on stand-by service as late as 1965.
Norfolk Southern (original) - steam operations ended in January 1954
Northern Pacific Railroad - last steam on the Northern Pacific was in 1960
Northwestern Pacific - By 1957, 4-6-0 #112 was the last steam locomotive on the NWP. It later retired from service in 1962.
Pennsylvania Railroad - last steam in regular operations was in 1957.[25] However, B6 class 0-6-0 switcher #5244 kept operating for the Union Transportation Company until July 1959.[26]
Pittsburgh and Lake Erie Railroad - This short but very important Class 1 railroad completed its dieselization program in 1953.
Reading Railroad - dieselization completed around 1957, however B-4a class 0-6-0ST switcher #1251 still operated on the active roster until it's retirement in February 1964.[27]
Richmond, Fredericksburg and Potomac Railway - dieselization completed in 1952. However a huge number of 4-8-4s were leased to the Chesapeake & Ohio Railroad around this time. They were finally retired and scrapped in 1959.
Rutland Railroad - last steam locomotives, the L-1 class 4-8-2s, retired in March 1955.
St. Louis Southwestern - steam operations ended in 1953
Savannah & Atlanta - steam was phased out in 1955, but 4-6-2 #750 still operated on work trains until 1962
Seaboard Air Line Railroad - mainline traffic dieselized by 1955
Southern Pacific Railroad - dieselisation completed in 1958
Southern Railway - dieselisation completed on June 17th, 1953, although some steam locomotives such as the As-11 and Ms-4 2-8-2s were on reserve service until 1954.
Spokane, Portland & Seattle - the last steam locomotive retired in 1960.
Tallulah Falls Railway - switched to diesel power in 1948. However, 2-8-0 #75 was temporarily re-instated in 1950 for the film I'd Climb the Highest Mountain
Tennessee, Alabama & Georgia Railway - steam phased out by 1951
Tennessee Central Railway - last steam operations in 1952, although a few 2-8-2s and 4-8-2s were still kept on stand-by service until March 1955
Tennessee Railroad - dieselised in 1957
Texas & Pacific - steam phased out in 1952; however, the T&P bought Fort Worth & Denver 2-8-2 #410 in the late 1950s as a source of backup power especially during floods. It was retired in 1962.
Union Pacific Railroad - first diesel in 1934; last new steam in 1944;[28] last passenger steam run 1958; dieselisation completed in 1959; stand-by steam ended in 1962. However, steam locomotive UP 844 was never retired, and UP 3985 reentered excursion service in 1981 UP 4014 is set to renter service in 2019.
Unadilla Valley Railway - The railroad purchased its first diesel in 1947, but steam power held on until 1956.
Virginian Railway - fully dieselized in 1957, but a few steamers were still kept on standby service until January 1960.
Virginia Blue Ridge Railway - last steam locomotive retired in 1963.
Wabash Railway - fully dieselized in 1956
Western Maryland Railroad - dieselization on east of Hagerstown in 1949, end of steam system-wide in 1954
Western Pacific Railroad - dieselisation completed in 1953 (last steam operated on subsidiary Tidewater Southern)
White Pass & Yukon Route Railroad - last new steam locomotives arrived in 1947; dieselisation complete on June 30, 1964
Winston-Salem Southbound Railway - steam ended in 1957
Wrightsville and Tennille Railroad - steam ended in 1962.
Asia
Japan
The majority of Japan's rail network had been electrified in the post-war years. In spite of this, more desolate railway lines, particularly on the northern island of Hokkaido continued to use surplus steam locomotives well into the mid-1970s. This was due to the limits and problems created by the then-nationalized rail network, Japanese National Railways (JNR). Japan also has large coal deposits as a natural resource. By 1970, most, if not all steam locomotives had been relegated to freight work, and by the time that complete dieselisation occurred, the remaining steam locomotives were used for branch line work and shunting duties and later were put out of use completely..
India
Diesel and electric locomotives started slowly replacing steam in 1950s. The last broad gauge (5' 6") steam locomotive built by CLW was a WG class locomotive named Antim Sitara (The last star), #10560, built in June 1970. The last meter gauge steam locomotive was a YG class built in 1972.[29]  Steam was largely replaced in 1980s. The last scheduled steam operation was on 6 December 1995 on broad gauge. Last steam operation on narrow/meter gauge ended in 1999.[30]
Two heritage lines, the Darjeeling Himalayan railway and the Nilgiri mountain railway have retained steam service.
See also
Alternative fuels
Advanced steam technology
Electric vehicle — and the concept of transport electrification
Hybrid vehicle
Energy policy and politics
Efficient energy use
Energy policy
Golden gimmick
Pershing Map
Suez Crisis
Diesel fuel
Aramco
Diesel
Diesel engine
Winter diesel
Transportation
Baldwin Locomotive Works
Beeching axe
General Motors streetcar conspiracy
Woodham Brothers scrapyard in Barry, South Wales
Spelling
spelling differences


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