RandallW wrote: ↑Sun May 21, 2023 7:15 pmYou did notice that the SC-42DM has both the electrical pickup and diesel in a single engine, i.e., if its design is dumb, its no dumber than the ALP-45DP, and unlike the ALP-45DP, can run on the 101 miles of the MNRR that are electrified?
Third rail DMs are dumb for three reasons:
1. Third rail isn't continuous, so locomotives can gap out.
2. Third rail has a hard time dealing with the amperage of a single modern locomotive compared to EMUs.
3. Third rail only operates on closed commuter systems, not Amtrak.
Third rail DMs are dumb because the capital would be better spent to just electrify to Poughkeepsie, Danbury, Oyster Bay, Port Jefferson, and Patchogue, and end one-seat service north of Southeast and east of Patchogue in favor of limited direct diesel service to White Plains and Jamaica with standard off-the-shelf diesel push-pull or DMU equipment. Most service on those lines would be better served by DMU service connecting at Ronkonkoma, Patchogue, and Southeast.