Sounds like it's mainly used for maintinence-of-way work, and if they need to use it to pull any electric railcars around, then they'll put an adapter on. If there was the non-standard railcar coupler on there all the time, then it would be a real hassle anytime they sent it over to the South Shore for freight service, because I don't think they can put a knuckle adapter on it so they'd need to change the coupler entirely.