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 production examples, were the last …

A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame; it is not an articulated …

2020年11月17日 · The first experimental duplex on the PRR was the S1, a huge rigid frame duplex locomotive of the 6-4-4-6 wheel arrangement. This engine was over 146' long! This …

2020年6月20日 · The PRR T1 was a duplex locomotive that utilized a 4-4-4-4 wheel arrangement and was designed to haul 880 trailing tons (798-t) at 100 mph (161 km/h). PRR envisioned …

The first experimental duplex on the PRR was the S1, a huge rigid frame duplex locomotive of the 6-4-4-6 wheel arrangement. This engine was over 146' long! This locomotive was built by the …

Strange yet appealing "siarknose" design by Raymond Loewy gives the PRR duplex a unique look. Here it's ready to pull the trailing passenger train, sometimes hitting 80-100mph speeds. …

2024年11月2日 · The Duplex Drive was a fascinating step forward in steam locomotive technology first employed on the Baltimore & Ohio during the 1930s but made famous by the …

2018年7月25日 · There is some evidence that PRR had solved, in principle, most of the operating issues with the T1 in 1948 (this being the Franklin type A poppet version, not wholesale …

The 1942-built Q1 was the PRR's first freight Duplex prototype. It was built with huge 77" drivers and streamlining. One of the handsomest streamlined engines built at that time.

The theory behind the duplex drive held that reducing the masses of reciprocating (e.g., main and side rods) and revolving (e.g., cranks and counterweights) would reduce hammering and raise …