A. Open the globe valve in the steam pipe to the turbo-generator, at
least two turns. The water-glass, steam and air gauge lamps in the cab,
and the number indicator lamp in the headlight case should light up as
soon as the turbo-generator reaches full speed. A double-throw knife
switch in the cab controls the headlight. In one position the switch
gives the full brilliancy of the headlight. The opposite or "dimmer"
position reduces the brilliancy about one-half. When the switch bar is
in neither position the headlight is entirely out, and only the number
lamp is burning. The classification lamp, lubricator and order or
reading lamp, are controlled by a small switch on the socket of each
lamp.