A 4-4-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one with four leading wheels arranged in a leading truck, four coupled driving wheels (two driving axles), and four trailing wheels in a trailing truck. In the United States, this arrangement was named the Reading type, since the Philadelphia and Reading Railroad was the first to use it. In Canada, this type was known as the Jubilee. ...more on Wikipedia about "4-4-4"
The Chicago and Northwestern Railway's Class E-4 comprised nine coal-burning streamlined 4-6-4 "Hudson" steam locomotives built in 1938 by ALCO. ...more on Wikipedia about "CNW Class E-4"
The Princess Coronation Class is a class of express passenger steam locomotives built by the London Midland and Scottish Railway (LMS) and designed by William Stanier. They were an enlarged version of the LMS Princess Royal Class. Several examples were originally built as streamlined, though this was later removed. ...more on Wikipedia about "LMS Princess Coronation Class"
Sir Nigel Gresley introduced the famous LNER Class A4 locomotives in 1935 to pull a new train called the Silver Jubilee, between London King's Cross and Newcastle, in celebration of King George V's 25th year of reign. ...more on Wikipedia about "LNER Class A4"
Number 4468 Mallard is a London and North Eastern Railway Class A4 4-6-2 Pacific steam locomotive built in the 1930s by the LNER and designed by Sir Nigel Gresley in Doncaster, England. It was designed as an express locomotive with a wind-tunnel tested, aerodynamic body that allowed it to reach speeds of over 100 mph (160 km/h). It was in service until 1963 when it was retired after a lifetime distance of almost 1.5 million miles (2.4 million km). It was restored to working order in 1988 to celebrate its 50th anniversary, but as of September, 2003, it is out of service without a current boiler certificate. Mallard is now part of the national collection at the United Kingdom's National Railway Museum in York. ...more on Wikipedia about "LNER Class A4 4468 Mallard"
The London and North Eastern Railway (LNER) Class B17, also known as "Sandringham" or "Footballer" class was a class of 4-6-0 steam locomotive designed for hauling passenger services on the Great Eastern Main Line. ...more on Wikipedia about "LNER Class B17"
The Milwaukee Road's class A comprised four (#1–#4) high-speed, streamlined 4-4-2 "Atlantic" type steam locomotives built by ALCO in 1935-37 to haul the Milwaukee's Hiawatha express passenger trains. They were among the last Atlantic types built in the United States, and certainly the largest and most powerful. The class were the first locomotives in the world built for daily operation at over 100 mph, and the first class built completely streamlined, bearing their casings their entire lives. Although partially supplanted by the larger F7 "Hudsons" from 1937, they remained in top-flight service until the end. Locomotive #3 was taken out of service in 1949 and cannibalised for spares to keep the other three running until 1951. None survive. ...more on Wikipedia about "Milwaukee Road class A"
The Milwaukee Road's class F7 comprised six (#100–#105) high-speed, streamlined 4-6-4 "Baltic" or "Hudson" type steam locomotives built by ALCO in 1937–38 to haul the Milwaukee's Hiawatha express passenger trains. Following on from the success of the road's class A 4-4-2s, the F7s allowed the road to haul longer trains on the popular Chicago– Twin Cities Hiawatha routes. ...more on Wikipedia about "Milwaukee Road class F7"
Hudson was the name given to the 4-6-4 steam locomotive wheel arrangement by the New York Central Railroad (NYC) who were the first to use locomotives of this type in North America. ...more on Wikipedia about "NYC Hudson"
The Pennsylvania Railroad's K4s 4-6-2 "Pacific" (425 built 1914– 1928, PRR Altoona, Baldwin) was their premier passenger-hauling steam locomotive from 1914 through the end of steam on the PRR in 1957. ...more on Wikipedia about "PRR K4s"
The Pennsylvania Railroad's class Q1 comprised a single experimental steam locomotive for freight service, #6130, built in March 1942. A duplex locomotive, it had a wheel arrangement of 4-6-4-4, comprising a four-wheel leading truck, two sets of four and six driving wheels mounted in a rigid locomotive frame, and a four-wheel trailing truck. The first group of six driving wheels was driven by a pair of cylinders mounted conventionally in front of them, while the rear four driving wheels were driven by cylinders mounted behind them on either side of the firebox. ...more on Wikipedia about "PRR Q1"
The Pennsylvania Railroad's class S1 comprised a single steam locomotive of 6-4-4-6 wheel arrangement in the Whyte notation, the only locomotive of such arrangement ever constructed. The S1 was a duplex locomotive: it had two pairs of cylinders, each driving two pairs of driving wheels, but its driven wheelbase was rigid, unlike similar-looking articulated locomotive designs. The locomotive was displayed at the New York World's Fair of 1939, lettered American Railroads rather than Pennsylvania Railroad. The streamlined shell was designed by Raymond Loewy. ...more on Wikipedia about "PRR S1"
The Pennsylvania Railroad's 52 T1 class duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 (2 prototypes) and 1946 (50 production) were their last-built steam locomotives, and their most controversial. They were ambitious, technologically sophisticated, powerful, fast, and uniquely streamlined by Raymond Loewy. However, they were also prone to violent wheelslip, complicated to maintain, and expensive to run. In 1948, the PRR vowed to place diesel locomotives on all express passenger trains, leaving unanswered whether the T1's flaws were solvable. ...more on Wikipedia about "PRR T1"
The term Royal Hudson refers to a group of semi- streamlined 4-6-4 Hudson steam locomotives owned by the Canadian Pacific Railway (CPR) and built by Montreal Locomotive Works (MLW). In 1939, King George VI allowed the CPR to use the term after one of the locomotives transported the royal train across Canada. These locomotives were in service between 1937 and 1960. Four of them have been preserved, and one was used in excursion service on the British Columbia Railway between 1974 and 1999. ...more on Wikipedia about "Royal Hudson"
Selkirk steam locomotive 2-10-4 built by Montreal Locomotive Works, Montreal, Quebec, Canada. ...more on Wikipedia about "Selkirk locomotive"
The Southern Railway (SR) Merchant Navy Class is a class of 4-6-2 steam locomotive designed for express passenger work. Thirty were built incorporating a number of novel design features, including an oil bath for the train-driven valve gear, oval smokebox door and an unusually shaped smokebox. The SR considered naming them after cathedrals, then victories of World War II (a mocked-up nameplate "Graf Spee" was produced). They were eventually named for the major shipping companies of the time, a few of which still exist. ...more on Wikipedia about "SR Merchant Navy Class"
The Southern Railway (SR) West Country and Battle of Britain Classes, also known as Bulleid Light Pacifics are classes of streamlined 4-6-2 steam locomotive, which were designed for express passenger work in South-East and South-West England. 110 were built. ...more on Wikipedia about "SR West Country Class"
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