TM 55-2210-224-12
2-29. MULTIPLE-UNIT OPERATION (cont)
(c) Automatic brake valve (4) to HANDLE-
OFF position and independent brake valve
(5) to RELEASE position. Remove both
handles.
(d) Reverser handle (6) to NEUTRAL position
and remove handle.
(e) Throttle handle (7) to IDLE.
(f) MU HEADLIGHT SETUP switch (8) to
TRAIL UNIT FRONT or TRAIL UNIT
REAR position, as appropriate.
(g) Release handbrake (9).
(3) Return to lead locomotive and, if not already
started, start in accordance with paragraphs 2-
10 and 2-11.
(4) Set controls on lead unit as follows:
(a) MU HEADLIGHT SETUP switch (8) to
LEAD UNIT FRONT or LEAD UNIT REAR
position as appropriate.
(b) Set handbrake (9).
d. Operating.
(1) In multiple-unit operation, all connected locomotives are controlled from one cab. The controlling
locomotive is handled in the same manner as operating a single unit. If the lead unit experiences low
oil pressure or cooling system overheating, the engine system buzzer in the lead unit will sound. If a
trailing unit experiences these conditions, the engine system buzzer in the affected unit will sound and
the multiple-unit engine system warning bell in the lead unit will sound.
(2) Make the following checks:
(a) Set independent brake valve (5) to RELEASE. Make a 10-psi reduction with automatic brake
valve (4). Check that brakes on both units set. Set automatic brake valve to RELEASE. Check
that brakes on both units release. Set independent brake valve to FULL APPLICATION.
2-41
