Back in 1978, the B&M supplied a number of GP7s and GP9s to haul the Budd Cars after the storm
It actually became mostly a permanent arrangement, as the Budds were no longer able to haul
themselves. The MBTA does not have too many spare locos. If the storm is real bad, would
PAR provide some GP40s for a few days to haul MBTA trains, providing there was an MBTA
unit providing HEP, even if it is not up to hauling the train? PAR has "rescued" a few
Downeasters over the years, but that was in a short notice emergency situation. Maybe.
P&W would pony up a couple of locos.
There are really two different issues here, regular MBTA/B&M operations in 1978 and beyond and the emergency operations following huge snowstorms.
The MBTA had actually started using B&M Geeps to haul aging and under-maintained RDCs on a limited basis prior to the Blizzard of 78. I believe there were two North Side sets prior to 2/78, one on the Lowell line and the other (I think) on the Rockport line, with a GP7 on each end of a string of ailing Budds. An engine was used at each end since unlike current push/pull sets they initially couldn't be controlled from the opposite end. Following the blizzard, and in large part because of widespread damage to the under-floor engines of the RDCs, GP7-hauled RDC sets became routine for several years. These, unlike the pre-blizzard sets, were trainlined so that only one Geep was necessary and it could be controlled from the RDC cab at the other end when in push mode. A gentleman from the B&M came up with the necessary control hardware. The RDCs used on these trains needed only one working engine to power lights and heat (all but the RDC9s had two), so that permitted cars with a dead engine to remain in service and indeed engine transplants left some of them with only a single engine in place.
In the immediate aftermath of the blizzard, a second issue was that lightweight RDCs would tend to derail when they hit snow-packed grade crossings, so locomotives were used at each end until the tracks were clear. Historically, both the B&M and the New Haven sometimes piloted RDCs with locomotives in heavy snow. That emergency operation in 2/78 (which used GP9s as well as the GP7s that would be permanently assigned to commuter service) ended within a week or so. I suppose that these days that could potentially apply to cab control cars as well, but of all the US and Canadian commuter operations in snow territory I am unaware of any that have a practice of attaching locomotives ahead of push/pull cab cars in heavy snow. (Amtrak had a different policy with the ex-Metroliner cab cars on the
Vermonter, though.)