The ALCO RS-3m is the name for an ALCO RS-3 road switcher that was rebuilt with a different prime mover. In the best known program, 98 locomotives received the more reliable EMD 567B engine and fans salvaged from retired E8 units, with 56 done at the former Pennsylvania Railroad Juniata shop and many at the former New York Central DeWitt shop between 1972 and 1978 under Conrail. Other railroads made their own versions, including New Haven rebuilds that kept the Alco 244 engine, Missouri Pacific GP12 conversions, Chicago and North Western units with a 251 engine, and Green Bay and Western RS-20 conversions. Some still work on shortlines and in museums.
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Source ALCO RS-3m (Wikipedia)
Of Make
Source ALCO RS-3m (Wikipedia)
Sources
1. ALCO RS-3m (Wikipedia)
Lead, rebuild program
The RS3m rebuild program started in 1972 and continued until 1978 under Conrail.
Lead, engine
These 98 locomotives were rebuilt to replace their original ALCO prime mover with the more reliable EMD 567B engine and fan assemblies taken from retired E8s.
RS-3m units today
As of 2021, rebuilt RS-3s can be found in museums, on shortlines and as industrial switchers.
Lead
The ALCO RS-3m is a diesel-electric locomotive rebuilt from an ALCO RS-3 road switcher.
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