F-Line to Dudley
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Assuming an electrified Purple Line, they'd presumably switch to E-mode at Worcester Union Station. But power-switching is hardly flawless. Grand Central and Penn deal with that on a weekly basis with the fast-aging Genesis P32AC-DM dual-modes not switching when they're supposed to switch and holding trains up by the tunnel mouths while they wait for the station vent fans to kick in, the designated emergency diesel specialty platforms to be cleared for reassignment, and permission to proceed after an often lengthy delay. Amtrak's definitely gonna demand the right to run to South Station in diesel mode at any time for any reason so they don't have to deal with regulatory complications and the painful schedule delays associated with them.Not to mention Amtrak Lake Shore Limiteds and Inland Regionals - my understanding is that even a Dual Mode Airo running on the Inland is likely to pull into South Station in Diesel mode, as the Worcester Line tracks aren't wired up at Back Bay, only the final ½ mile in the S. Station terminal district. (Assuming the Airo has to swap at a stop? I haven't seen anything to indicate it can do it in motion.)
Hell, the T doesn't even hold to a hard-and-fast rule on diesels facing forward into the terminals. They face away from Boston in normal practice because the engine hot-start plugins at each of the layover yards is purposefully sited on the away-from-Boston facing end of the yards. But contingencies allow for loco-forward at any time (and the Cape Flyer usually runs with double-ended locos because of breakdown liability fine print on the out-of-district running miles). This past week they've been doing a LOT of forward-running inbounds as rescues and substitutions for mechanical breakdowns in this weather hastily flip a lot of running sets in the opposite direction.
It's never gonna make sense to fully enclose the surface terminals. Anything on the platform is always going to need to be all-weather infrastructure, even in the current semi-enclosed state of SS.