TM 55-2210-224-12
2-9. OPERATION OF BRAKE SYSTEM (cont)
(4)
SUPPRESSION Position. This position is used on brake pipe testing and on brake
systems that have penalty and safety control brake protection. The brake system on this
locomotive does not contain penalty or safety control features.
(5)
HANDLE-OFF Position. This position is located at the first quadrant notch, to the right of
SUPPRESSION position. The handle is removable in this position. This is the position
in which the handle should be placed on trailing units of a multiple-unit locomotive or on
locomotives being towed dead in a train.
(6)
EMERGENCY Position. This position is located to the extreme right of the brake valve
quadrant. It is the position that must be used for making emergency brake applications
and for resetting after an emergency application if break-in-two feature is available.
b. Cutoff Pilot Valve.
(1)
The
cutoff
pilot
valve
portion
provides the function of the old
double heading cock for cutting in
and cutting out the brakes when
desired. The two-position type is
employed on locomotives intended
for freight service only, and its
positions are IN and OUT. The
cutoff valve handle is held in each of
its
handle
positions
by
spring
loading, and it is necessary to first
depress the handle before it can be
moved from one position to another.
(2)
For
normal
operations
of
the
locomotive as a controlling unit, the
cutoff pilot valve handle must be
placed in the IN position. OUT
position is to be used when hauling
the locomotive dead or as a trailing
unit in a multiple-unit locomotive. It
is also placed in OUT position when
making brake pipe leakage test.
2-25
