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The Q2 locomotive was 78% more powerful than the locomotives that PRR had in service at the time, and the company claimed the Q2 could pull 125 freight cars at a speed of 50 mph (80 km/h). [5] These were an improved version of the previous Q1 class , which was a 4-6-4-4 dual-purpose engine instead of a 4-4-6-4 freight engine.
The Q class comprised what were effectively 4-10-4s with the driving axles split into two driven groups. The Q2 was the most powerful non-articulated steam locomotive ever built and also holds the record for highest horsepower recorded by any steam locomotive at 7,987 hp. Q1 - experimental duplex freight locomotive. Q2 - duplex freight locomotive.
The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives, in which both sets of driving wheels were mounted in a common, rigid locomotive frame. This locomotive design was a further development of the highly successful 2-10-4.
In operation, the Q2 could outperform pre-existing freight engines hauling double the tonnage of their predecessors. Furthermore, the Q2 had no problems building up steam power and was known to be a very smooth-riding engine. 26 were built at PRR's Altoona Works, and they were by far the most successful duplex type. The duplex propensity to ...
Pennsylvania Railroad Odd D 10003; Pennsylvania Railroad class D1; Pennsylvania Railroad class D2; Pennsylvania Railroad class D3; Pennsylvania Railroad class D4; Pennsylvania Railroad class D5; Pennsylvania Railroad class D6; Pennsylvania Railroad class D7; Pennsylvania Railroad class D14; Pennsylvania Railroad class D15; Pennsylvania Railroad ...
The Pennsylvania Railroad class Q1, #6130, was a single experimental steam locomotive designed for dual service. The locomotive entered service in 1942, and retired in 1949 after accumulating a relatively low 165,000 service miles.
These were some of the most powerful reciprocating steam locomotives ever built, at 7,500 hp (which was exceeded by only the Pennsylvania Railroad class Q2 in indicated horsepower), and one of the heaviest at 386 tons for the locomotive itself plus 215 tons for the loaded tender. Other equivalent classifications are:
Engine 643 is maintained by volunteers of the Williams Grove Historical Steam Engine Association outside of Harrisburg, and is operated several weekends each summer. [63] As of 2020 [update] however, a major construction project has been underway since 2014, building a new operational example of a class T1 engine numbered 5550 , as all original ...