Moderator: Luther Brefo
DutchRailnut wrote:506 is a RS3u and not a RS3m.
Alcoman wrote:Consider what the letters mean: " M" means modified and "U " means upgraded. In this case, it was both. However, these D&H units were rebuilt by Morrison-Knudsen and given an UPGRADED horsepower from 1600 to 2000 hp, A 12-251 engine and they reworked the TM blower system which amounts to an UPGRADE. Like the D&M units, they were given the letter "U" to signify an UPGRADE regardless how the railroad labeled them. In Dick Steinbrenners book, they are referred to RS-3u in all references.
Like the D&M units, they were given the letter "U" to signify an UPGRADE regardless how the railroad labeled them.
DutchRailnut wrote:a RS3m is Conrail designation for EMD re-engine units with a 12/567 in them.
RS3u is upgrade where a RS3 is upgraded with newer ALCO components including prime mover.
Benjamin Maggi wrote:Is the Tioga Central replacing the Alcos with different engines, or closing down?
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