by Allen Hazen
Title is meant to suggest hybrids or intermediates or ...
I believe that, when the 12-251 engine was new but before it was introduced on production locomotives, a small number of FA-2 locomotives (Lehigh Valley? and/or New York Central?) were (temporarily?) re-engined with 251 engines for testing.
QUESTIONS: (1) General information about the test program and the locomotives involved? (Open-ended question!)
(2). I think the dimensions of the 12-251 and 12-244 engines were slightly different. (2a) How different? And that, though there was enough room inside the FA-2 carbody to allow the slightly larger engine to be fitted in, this might not have been possible with an FA-1. (2b) Is this so?
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In addition to its new-build FPA-4 locomotives, Canadian National had a small number (2?) of FP-2 locomotives that had been re-built with 251 engines. I think they were rebuilt slightly before the FPA-4 units were build; I assume that their success was what convinced CN to order the FPA-4.
QUESTIONS: (3) Relevant historical details on this episode?
(4) Were the rebuilt FPA-2 and the new-build FPA-4 treated as equivalent by CN?
(5) Slightly more general: Other than having the newer, slightly more powerful, engine (and the external aftercooler radiator that reveals it), how different was an FPA-4 from an FPA-2? Was the carbody structure (framing, truss spacing, etc) the same?
I believe that, when the 12-251 engine was new but before it was introduced on production locomotives, a small number of FA-2 locomotives (Lehigh Valley? and/or New York Central?) were (temporarily?) re-engined with 251 engines for testing.
QUESTIONS: (1) General information about the test program and the locomotives involved? (Open-ended question!)
(2). I think the dimensions of the 12-251 and 12-244 engines were slightly different. (2a) How different? And that, though there was enough room inside the FA-2 carbody to allow the slightly larger engine to be fitted in, this might not have been possible with an FA-1. (2b) Is this so?
--
In addition to its new-build FPA-4 locomotives, Canadian National had a small number (2?) of FP-2 locomotives that had been re-built with 251 engines. I think they were rebuilt slightly before the FPA-4 units were build; I assume that their success was what convinced CN to order the FPA-4.
QUESTIONS: (3) Relevant historical details on this episode?
(4) Were the rebuilt FPA-2 and the new-build FPA-4 treated as equivalent by CN?
(5) Slightly more general: Other than having the newer, slightly more powerful, engine (and the external aftercooler radiator that reveals it), how different was an FPA-4 from an FPA-2? Was the carbody structure (framing, truss spacing, etc) the same?