The green berkshires were the P&LE’s berkshires, NYCS class A-2a, built ALCo, 1948, and in fact, ALCOs last steam. The P&LE’s berkshires were not like the other ones on the various roads.
The original Lima design, first tested on the B&A was supposed to haul a larger train faster than the mikados then in use. It did so on its first test. The NYCS management was so convinced that it bought fifty as a result of the demonstration.
Prior to that the NYCS certainly did have its problems with mikados. The H-5s were converted from G-5s (2-8-0) and must have been less than satisfactory as many were retired early.
The H-7s were apparently allright, but some, though not all, of those were even retired early.
The major disaster was the H-8, unique to the P&LE.
The first really good mikados on the NYCS seem to have been the H-9s and H-6s, USRA heavy and light, respectively (the former being referred to as ‘government engines’ on the P&LE). The H-6s seem to have run on the whole system with the exception of the P&LE and B&A. The H-9s were unique to the P&LE. Many H-6s were conveyed to the NYC&StL when it took over the LE&W.
The really good ones were the H-10s. They ran system-wide. Some have evne called them the first 'superpowers. Some were even equipped with steam lines and signalling devices to allow them to be pressed into passenger service. The P&LE had five or so of these (in additon to its own) acquired used from the NYC and rebuilt with vestibule cabs. It was Woodard at Lima who designed the first H-10, MC 8000. Its success was the beginning of his ultimate design, the A-1, which , as stated, the B&A bought, eventually acquiring fifty-five of them, all Lima-built. Such was not the norm for the NYCS, it tended to prefer ALCo.
The P&LE’s berkshires were really overgrown mikados. Their sixty-three inch drivers were designed for drag freight rather than speed. Speed was included in the design concept for the