mounted on the main generator frame. A starting
field on the main generator permits starting the
engine from the battery, as previously mentioned.
The four Westinghouse 370-B traction motors
are nose-suspended and geared to the outer axles
of each truck. The gear ratio is 21:58 and the
maximum speed of the locomotive is 90 m.p.h. The
motors are force-ventilated, separate fans blowing
air through the center pin and truck frame.
The auxiliary generator of the generator-exciter
set supplies power for charging the 56-cell storage
battery, and for the control and lighting circuits.
A voltage regulator holds a constant voltage on
the auxiliary generator at all engine speeds. The
exciter is of the differential type and furnishes
power for exciting the field of the main generator.
The exciter, in conjunction with an engine control
load regulator, maintains full load on the diesel
engine throughout the operating range.
The control of the locomotive is electro-pneu-
matic and provides for two steps of field shunting.
Transition from full field to shunted field is auto-
matic. Engine speed is controlled by a governor
with pneumatic operator, a movement of the throt-
tle resulting in a corresponding movement of the
governor operators on each of the two engines.
The only connection between the throttle handle
and the governor, consists of a single air line, thus
eliminating all complicated levers and mechanical
connections. This arrangement simplifies the oper-
ation of two or more locomotive units in multiple,
controlled from one cab. In addition to the gover-
nor, an independent over-speed stop is provided.
Wheel-slip control is a feature of every Baldwin-
Westinghouse diesel-electric locomotive. Relays
automatically reduce power when wheels slip,
and give an audible indication in the operator's
compartment. This device works through the en-
gine governor, reducing diesel engine speed as
soon as wheels start to slip. When slipping stops,
the engine speed is smoothly increased until it
corresponds with the position of the throttle han-