Double-header

DOUBLE-HEADER"Train hauled by two engines
DOUSE THE GLIM"Extinguish a lantern, especially by a sudden upward movement
DRAG"Heavy train of "dead" freight; any slow freight train, as contrasted with manifest or hotshot ...

Double-header
A train pulled by two locomotives, each with its own engine crew, as opposed to diesel or electric locomotive units operating as a single locomotive with one crew.
Doubleheading
See Double-header ...

Double-header
A train pulled by two locomotives, each with its own crew.
Double Stack (or Stacks)
Intermodal service characterized by shipping containers that are stacked two-high on railcars.

Helper - The second or added locomotive on a double-header.
HEP - (Head End Power) Electricity from the locomotives Generator which is used by another locomotive, or passenger cars for heating ,cooling, and lights.

See also: Siding, Passenger train, Signal, Car, Crew