2-9. OPERATION OF BRAKE SYSTEM (cont)
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.
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
b. Cutoff Pilot Valve.
The cutoff pilot valve portion provides the function
of the familiar 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 positively 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.
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.
Independent Brake Valve.
independent control of the locomotive brake
cylinder pressure, irrespective of the train
brakes. The brake valve handle has two
positions; RELEASE position at the extreme
APPLICATION position at the extreme right
end of the quadrant. From RELEASE to FULL
APPLICATION position is an application zone
or sector and the further the handle is moved to
the right into this sector, the greater will be the
application of brakes until a full application is
obtained at the extreme right end of handle