watervapr wrote:What would the process for running EMU's on the providence line (not stoughton) look like? From pictures it looks like the entire line from providence to SS (including the 3-track segments) is electrified, minus TF Green since the platform is on a siding that doesn't have wiring.
TF Greene is not on a siding. The platform is on Track #3, which is a main line track, but was never electrified. Also, electric trains can't operate on Tracks #3 & 4 at Attleboro.
watervapr wrote:Could we procure 2 or 3 8-car trainsets, wire up some sidings and maintenance facilities, negotiate with amtrak for some voltage, and theoretically get it running by 2021?
It's not practical as the MBTA's sets need to be versatile to go on any line when service warrants. It's not a good investment since the majority of the fleet is, and will always be, diesel.
watervapr wrote:Which tracks at SS/Back Bay are already under wire?
All 3 tracks of the NEC are wired between Transfer & Boston.
watervapr wrote: Given the state of existing infrastructure I don't get why this wasn't set up a decade ago.
Simply because the electrification was done for Amtrak trains, and it's not a sensible move for the T.