TM 55-2210-224-12
2-29. MULTIPLE-UNIT OPERATION (cont)
(b) Push sand control (10). Check that both units deliver sand to the rails.
(c) Set throttle handle (7) to position 3. Check that both units increase in power.
(3) Release handbrake (9) and operate as required.
e. Changing operating cab.
(1) In the cab which has been controlling, set controls as follows:
(a) Set throttle handle (7) to IDLE.
(b) Set automatic brake valve (4) to FULL SERVICE.
(c) Set cutoff pilot valve (2) to OUT position.
(d) Set automatic brake valve (4) to HANDLE-OFF position and independent brake valve (5) to
RELEASE position. Remove both handles.
(e) Set reverser handle (6) to NEUTRAL position and remove handle.
(f) Set double-ported cutout cock (3) to CLOSED position.
(g) Set MU HEADLIGHT SETUP (8) to TRAIL UNIT FRONT or TRAIL UNIT REAR position, as
appropriate.
(2) In the cab which has been trailing, set control as follows:
(a) Install automatic brake valves (4) and independent brake valve (5). Move automatic brake valve
to FULL SERVICE position. Move independent brake valve to RELEASE position.
(b) Set cutoff pilot valve (2) to OUT position.
(c) Set reverser handle (6) to NEUTRAL position and remove handle.
(d) Set double-ported cutout cock (3) to CLOSED position.
(e) Set MU HEADLIGHT SETUP (8) to TRAIL UNIT FRONT or TRAIL UNIT REAR position, as
appropriate.
f. Stopping. To stop engines of any one locomotive when operating with multiple units, place ENGINE STOP 1
and ENGINE STOP 2 switches (11) in STOP position.
g. Uncoupling.
(1) Disconnect multiple-unit control jumper from both units.
(2) Uncouple mechanically in accordance with paragraph 2-19.
2-42
