The Pennsylvania Railroad (PRR) class I1s steam locomotives were the largest class of 2-10-0 "Decapods" in the United States. From 1916 to 1923, 598 locomotives were produced (123 at Altoona Works and 475 at Baldwin Locomotive Works ).

It is one of the Pennsylvania Railroad's class I1s steam locomotives, which were the largest of the Decapod type (2-10-0) in the US, weighing 366,500 lbs, 334,500 lbs on their 62” drivers. Five hundred and ninety-eight were built between 1916 and 1923, one hundred and twenty-three at Pennsy's Altoona shops and four hundred and seventy-five at ...

Mar 1, 2023 · What followed in quick succession was astounding: the gradual accumulation of 598 Decapods, including 475 from PRR’s stalwart supplier Baldwin. This cemented their status as the largest 2-10-0 Decapod fleet. The I1 became the standard PRR freight hauler. The sheer size of the fleet caught the attention of longtime Trains Editor David P. Morgan.

Beginning in 1930, almost all of the I1s engines were redesignated I1sa, which indicated a modification to the valves to permit running at cutoffs of up to 78%, equated to a starting tractive effort of 96,026 lb (43,557 kg or 427.14 kN).

The PRR decapod, class I1s, was unlike the Russian decapod; it was huge, taking advantage of the PRR's heavy trackage and high axle loading, with a fat, free-steaming boiler that earned the type the nickname of 'Hippos' on the PRR. Two giant cylinders (30½ x 32 inch) gave the I1s power and their tenders permitted hard and long workings between ...

Dec 7, 2021 · #4483 was built in May of 1923 by the Baldwin Locomotive Works in Eddystone, Pennsylvania for the Pennsylvania RR, #259 of a lot of 475, c/n 56534. This "Decapod" is the last one in existance of the "I-1s" class, of which 598 were built.

PRR #4483 is a 2-10-0 Decapod type steam locomotive that was build by Baldwin Locomotive Works in 1923. The locomotive was built as a Pennsylvania Railroad Class I1s but was converted to Class I1sa in 1931. The Class I1s was the largest decapod type design to be produced.

The Pennsylvania Railroad's class I1s steam locomotives were the largest class of 2-10-0 "Decapods" built in the United States, with 598 built 1916–1923 (Altoona: 123, Baldwin: 475). These locomotives were the premier freight locomotive type on the system until World War II, and they remained in service until the end of PRR steam in 1957.

Sep 19, 2019 · Trust me, no locomotive with one of more blind drivers (line PRR I1s) will ever operate over railroads which maintain self guarding switch frogs. We derailed the 4483 three times just getting it out of Northumberland yard.

The Pennsylvania Railroad's class I1s steam locomotives were the largest class of 2-10-0 "Decapods" in the United States. From 1916 to 1923, 598 locomotives were produced (123 at Altoona Works and 475 at Baldwin Locomotive Works). They were the dominant freight locomotive on the system until World War II and remained in service until 1957.