Read the text below. Use the words given in Capitals at the end of each line to form a word that fits in the space in the same line. Railroads use signals and other means of
controlling train .
The chief purpose of traffic control is to prevent
accidents and to make railroad faster, more
efficient and .
Most railroad signals consist of colored lights alongside
or over the track. Each color has a meaning.
Most railroads have adopted some form of the block
signal system. The system is designed to keep
a safe distance between trains on the same track.
Most blocks range from 1 to 2 miles. Only one train is
to be in a block at a time. Colored-light signals
control to the block. No train may proceed from
one block to the next without an all-clear signal.
Automatic block systems are used on all tracks
where trains travel at speeds of 60 mph and
more and where freight trains move at speeds of 50
mph and over.
The of automatic block signaling makes human
errors practically .
Besides, it is much and more reliable than the
manual one. VARY
MOVE
OPERATE
RELY
DIFFER
CHIEF
TRAVEL
ALLOW
ENTER
SIGNAL
PASS
APPLY
POSSIBLE
SAFE

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