76. Q. How should cab lamps, signal lamps, oil cans and lanterns be
cared for?

A. They should be kept clean, free from leaks and always filled and
ready for service before leaving terminals.

77. Q. About how many drops in a pint of valve oil when fed through a
lubricator?

A. About 4,500 drops.

78. Q. Assuming that five drops per minute are fed to each of two valves
and one drop per minute to the air pump, how many hours would be
required to feed one pint of valve oil?

A. About eight hours.

79. Q. Assuming that the engine is running twenty-miles per hour, how
many miles per pint would be run?

A. About 160 miles per pint.

80. Q. How many drops per minute should ordinarily be fed?

A. This will vary with the size of the locomotive and the work to be
performed. On small yard engines one drop per minute for each cylinder
is usually sufficient and one drop for the air pump every two or three
minutes. This depends on the condition of the pump and the service being
performed. For large engines in slow freight service four to five drops
per minute, and for large engines in heavy fast passenger service from