2-29. MULTIPLE-UNIT OPERATION
Two or more locomotives equipped for multiple-unit operation may be handled by a single operator if
connections are properly made. In addition to the conventional coupling of locomotive drawgear and air
lines, the electrical control circuits of the locomotives must be connected with a jumper which plugs into
the receptacles at the end of the locomotives.
Controls are then set so that power and brakes on all locomotives are controlled from one cab. The
controlling locomotive is the leading unit, and any coupled locomotives are trailing units.
Certain alarm and protective devices, and auxiliary controls such as sanding, are connected through the
jumper, but the power plants and heavy duty circuits of the coupled units remain entirely independent of
Model RS-4-TC-1A locomotive can only be hooked
up in multiple-unit operation with another Model
Couple locomotives mechanically in the usual manner. Refer to paragraph 2-18.
Connect trainline hoses as follows:
to Brake Pipe
M. R. Equalizing Pipe
to M. R. Equalizing Pipe
to Actuating Pipe
Indepentant Application and
to Indepentant Application and
Open trainline cutout cocks at the ends of air lines on both unit.
To protect trainline jumper from damage, position it
up and out of the way of the drawbar.
Connect trainline jumper to both units. Push each plug all the way into its receptacle and lock in place.