Re: EMUs
Layman’s question: Wouldn't that station be far more useful if we had EMUs (or DMUs), given how close together all these commuter rail stations would be? Between Yawkey and Brighton, it seems like a lot of stop and go in a short distance. Not a problem for trains designed for that, but a real pain for full locomotives.
Not to mention that those layover problems would be ameliorated by NSRL...
Wouldn't it be great if Tesla would build trucks that you could drop any existing unpowered commuter rail coach onto, that had some approximation of a Tesla Roadster 2020 drivetrain hooked up to each axle and the battery pack mounted in the truck so that all you have to do after that is hook up the brake lines and MU control cables?
https://www.tesla.com/roadster reports a 1.9s 0-60 time, which is better than 30 mph/s; I think some Metro North EMUs and some US streetcar specs list 3 mph/s, and if F=ma, if you're willing to have 1/10th the acceleration, you should be able to accelerate 10 times the weight. If the Roadster ends up weighing 4000 pounds (the weight isn't public AFAIK, but it does seem to have quite a large battery pack which probably isn't light), then each Roadster drivetrain ought to be able to accelerate 40,000 pounds, so four of them would be able to handle 160,000 pounds, and
http://www.kawasakirailcar.com/CT_MBTA claims the heavier of the Kawasaki bi-levels are only 131,000 pounds, which leaves some room for the battery packs to add a bit to the weight of the train.
There might be a need to improve the cooling and adjust the gear ratio in adapting the Roadster powertrain to commuter rail.
Edit: an alternate way to look at this is that the Tesla Semi claims 20 second 0-60 with 80,000 pounds and four motors (the 2020 Roadster has 3 of the same motors); perhaps a fourth motor per train axle would be needed to do 10 second 0-60 for 40,000 pounds per axle.