[Illustration]
A. The driving engine gauge on the left indicates the pressure of steam
used by the driving engine. The one on the right has two indicators, the
red indicator showing the steam pressure on the jet in left elbow, and
the black indicator showing the pressure on the jet in the right elbow.
15. Q. When train is standing on siding for a short period, what should
be done?
A. Shut stoker off by throwing operating rod on back head of locomotive
boiler out of running position.
16. Q. When train is to stand for a long time or engine is left at
terminal, what should be done?
A. The driving engine should be cut out entirely by closing main steam
line inlet and main lubricator connection, and in winter time all drain
cocks should be opened.
17. Q. If sufficient coal can not be supplied over front grates, what
may be the cause?
A. Distributors may be warped and point too low, or steam jets may be
plugged with pipe scale and not blowing freely.