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
five to seven drops per minute should be fed. Air pumps in freight
service where the brake pipe is in moderately good condition can usually
be run with one or two drops per minute when handling long trains of
cars equipped with air brakes.
81. Q. Will any bad results ensue from filling the lubricator full of
cold oil?
A. Yes; when the oil gets hot it will expand and may break the glass or
bulge or burst the lubricator.