PASSENGER TRAIN EQUIPMENT - All Aboard: The Complete North American Train Travel Guide - page 139

can produce enough electrical power to run 700 homes. Unlike
its predecessors, the P-40 has a modular design, so a faulty com-
ponent can be pulled out and replaced in much less time than a
similar repair in one of the older engines. P-40s are used through-
out the Amtrak system, with the exception of the Northeast Cor-
ridor between Boston and Washington, D.C.
There is a power car—it's not called a “locomotive”—at each end of a high-speed Acela
trainset. Photo by Geno Dailey
Amtrak's high-speed Acela trains have what is called a
“power car” at each end of the trainset, which is the term used
to describe the entire consist. Once assembled, these trainsets are
treated as a single unit, and cars are rarely added or removed.
Both of the Acela power cars are driving the train when it's mov-
ing, with the engineer controlling both with one set of controls.
The all-electric Acelas draw their power from an overhead wire,
the catenary , and only operate on the Northeast Corridor, where
they reach speeds of 150 miles per hour along several stretches
of track.