The Amtrak Downeaster operates between Brunswick, ME and Boston MA, in push-pull configuration. There is a conventional locomotive on one end. There is a “cabbage” (control/baggage) car on the other end, which is a FP40 body with the prime mover removed, and replaced with a rollup door to serve as a baggage car.
The model Amtrak Downeaster is seen here on the Cape Ann. Like the prototype, it operates in push-pull. FP40 229 is the powered loco, and dummy FP40 381 on the other end has been converted to a cabbage car by adding the rollup door on one side. Wires run between 229 and all other cars to light the passenger cars, and the lighting on 381. Each loco is also equipped with a red marker between the number boards, lit when the unit is trailing.