Passenger Power Switching
Amtrak's "Ethan Allen Express" contained multiple firsts for me, and among them was mid-trip power switching. This train requires power to be on both ends due to a change of directions in Rutland (another first), but going in-and-out of NYC, they only need one unit, so they add/remove a unit at the Albany-Rensselaer station.
From here, they run the surplus unit up to Amtrak's nearby Rensselaer shops for servicing. From a fan perspective, it also allows you to get out and photograph the train in the process. In this case, we're looking south towards NYC, and the 701 would be cut off in short order, allowing the rest of the train to run south with just the 716.
Passenger Power Switching
Amtrak's "Ethan Allen Express" contained multiple firsts for me, and among them was mid-trip power switching. This train requires power to be on both ends due to a change of directions in Rutland (another first), but going in-and-out of NYC, they only need one unit, so they add/remove a unit at the Albany-Rensselaer station.
From here, they run the surplus unit up to Amtrak's nearby Rensselaer shops for servicing. From a fan perspective, it also allows you to get out and photograph the train in the process. In this case, we're looking south towards NYC, and the 701 would be cut off in short order, allowing the rest of the train to run south with just the 716.