The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental duplex locomotive of the Pennsylvania Railroad. It was designed...

The Pennsylvania Railroad (PRR) class T1 duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 with two prototypes and later in 1945-1946 with 50...

The Pennsylvania Railroad class Q1, #6130, was a single experimental steam locomotive designed for dual service. The locomotive entered service in 1942...

The Pennsylvania Railroad K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the PRR, where they served as the primary main...

The Pennsylvania Railroad (reporting mark PRR), legal name The Pennsylvania Railroad Company, also known as the "Pennsy", was an American Class I railroad...

further interest. The next usage of the duplex type was the Pennsylvania Railroad's single S1, designed to meet a requirement to operate a 1,200 short tons...

locomotive developed by the Pennsylvania Railroad LNER Class S1, a class of British steam locomotives NER Class S1, a class of British steam locomotives...

kilometres per hour) by LNER Class A4 4468 Mallard, however there are long-standing claims that the Pennsylvania Railroad class S1 achieved speeds upwards...

the PRR's duplex locomotive classes and other experimental designs in the late steam era. Pennsylvania Railroad class S1 a lone prototype 6-4-4-6 used...

Pennsylvania Railroad 1737 was a 4-6-2 Pacific type K4 class steam locomotive built in 1914 as the first of its class and would haul heavier passenger...