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2. Pennsylvania Railroad class T1 - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania_Railroad_class_T1

   Photos of PRR 4-4-4-4 locomotives; An N Scale PRR T1 4-4-4-4 scratch building project; A group that intends to build a full-size PRR T1; YouTube video displaying the operation of T1's on the Pennsylvania Railroad - At 3 minutes and 15 seconds, an example of the T1's infamous wheel slip can be observed.

3. 4-4-4-4 - Wikipedia

   en.wikipedia.org/wiki/4-4-4-4

   The next locomotives to use the 4-4-4-4 arrangement were the Pennsylvania Railroad's 52 class T1 locomotives (although the single class S1 was originally intended to be a 4-4-4-4, it was later changed to 6-4-4-6 due to increased weight). These had the cylinders in front of the wheels they drove, so that the rear pair were between the two sets ...

4. Duplex locomotive - Wikipedia

   en.wikipedia.org/wiki/Duplex_locomotive

   The Q2 4-4-6-4 was the most successful example of the duplex locomotive constructed by the PRR. Production locomotives followed from the end of 1944, but these were rather different, the lesson that backward-facing cylinders next to the firebox were a poor design choice made clear.

5. Pennsylvania Railroad locomotive classification - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania_Railroad...

   The 4-6-4 arrangement was seen on the PRR only on electric locomotives. As a steam locomotive arrangement, it was poorly suited to the PRR's mountainous terrain, wasting much potential adhesive weight on non-driven wheels. That it was so widely used by the rival New York Central would also likely have factored against PRR adoption.

6. Pennsylvania Railroad class S1 - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania_Railroad_class_S1

   [4] [28] The PRR continued developing the T1 class of 4-4-4-4 duplex locomotives but wheel slip and mechanical failures also plagued the T1. Before Pennsylvania Railroad commissioned Baldwin Locomotive Works for the T1 in 1940, it had already begun developing duplex designs for fast locomotives since 1938, including a rigid-frame 4-2-2-4 and ...

7. Pennsylvania Railroad - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania_Railroad

   PRR Baldwin DS-4-4-660 switcher locomotive PRR EMD E8A passenger locomotive PRR EMD SD45 freight locomotive In June 1937, the Pennsy acquired its first diesel locomotive : a 600-hp diesel-electric switch engine from Electro-Motive Corporation (EMC), a predecessor of General Motors Electro-Motive Division (EMD).