The Rock Island acquired a very large number (42: about 1/15 of their total locomotive fleet!) of U28B units in 1966. One or two were explicitly replacements for wrecked U25B units (this, or one of these, being the last U28B built with a U25B-style carbody).
I assume -- but don't know for a certainty -- that these would have re-used major components from the wreck victim(s). ???
If it (they) did re-use engines from the U25B units, were the engines modified to give 2800 hp(*), or were these 2500 hp U28B?
(Question inspired by recent query about FT to GP-9 trade-ins or rebuilds on the EMD forum.)
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(*) As I understand it, the engines in "stock" U28B had a different exhaust manifold -- designed to get better turbocharging results -- from those in U25B, so you couldn't turn a U25B engine into a U28B engine just by re-setting the fuel racks. So, another question: what were the engines in the late U25B (for New York Central and SLSF) that had a 2750 hp rating like?
I assume -- but don't know for a certainty -- that these would have re-used major components from the wreck victim(s). ???
If it (they) did re-use engines from the U25B units, were the engines modified to give 2800 hp(*), or were these 2500 hp U28B?
(Question inspired by recent query about FT to GP-9 trade-ins or rebuilds on the EMD forum.)
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(*) As I understand it, the engines in "stock" U28B had a different exhaust manifold -- designed to get better turbocharging results -- from those in U25B, so you couldn't turn a U25B engine into a U28B engine just by re-setting the fuel racks. So, another question: what were the engines in the late U25B (for New York Central and SLSF) that had a 2750 hp rating like?