106. Q. Explain the passage of steam from the boiler to the steam heat
pipe.

A. Steam is admitted to the steam heat pipe, in which there is placed a
reducing valve through which it passes at reduced pressure, into the
steam heat pipe under the entire length of the train. The reducing valve
is located in the cab close to the steam heat throttle.

107. Q. If the steam heat gauge shows proper pressure, but the steam
heat pipe pressure appears to be low, what should be done?

A. If the steam heat gauge is showing the correct pressure, there is an
obstruction in the pipe somewhere, most likely in the steam heat hose,
and this should be looked for and remedied; if the gauge is correct,
then it is the reducing valve that is at fault and this should be
readjusted, as well as the gauge.

108. Q. What is the cause of failure with the second injector, and what
should be done to obviate this failure?

A. Lack of attention and failure to use every day will allow joints to
work loose and boiler check to fill up with mud and scale. It should be
tested every day and worked regularly so as to keep it in good working
order.

109. Q. If an injector stops working while on the road, what should you
do?

A. Would first ascertain if sufficient water was in the tender and
tender valve open, and that water was cool enough in the tender so the