with them. Not only does the position of a signal give information
to a railroader, but the color of the signal also has specific
meaning. The following list gives standard color indications for all
yellow ................proceed at restricted speed, and
other uses prescribed by the rules.
prescribed by the rules.
green and white .......flag stop.
blue ..................protect workmen.
purple ................stop (indication for siding derails).
These colors may be displayed in different ways or by different
For example, a yellow disk denoting a zone of restricted
speed may have the authorized speed printed on it in black numerals.
A blue metal disk on a portable stand by day, or a blue lantern or
blue light by night, is used as a signal by maintenance men. It is
displayed at one end or at both ends of an engine, car, or train to
show that workmen are under or about it.
No one except the person
placing the sign in position can remove it. A green and white signal
near the right-of-way on an approach to a station means that the
station is a flag stop.
If no signal appears at the station, the
train may continue without stopping.
2.17. OPERATIONS IN RADIOACTIVE AREAS
The discussions presented so far have covered the conduct of
railway personnel and the operation of railroads that proved
effective in such conventional warfare as that of World War H and the
Korean War. However, should nuclear weapons be used in a theater of
operations, large areas would be contaminated by radiation.
paragraph explains how railroads may be operated in areas where
nuclear weapons have been used.
To the untrained, the thought of nuclear warfare may be
overwhelming. The use of nuclear weapons to him is so awesome that
he thinks no further than the initial blast--destruction is final and
Such thinking is unfortunate; many people would probably
survive and definite plans should be made to enable them to recover