"B." CAUTION distance between train: The first train in same
position as in "A," the second train at the third home signal
in the rear; this signal can be passed under caution, and
this distance between trains is the caution distance, and is
always equal to the length of the block section, or two
overlaps.
"C." CLEAR distance between trains: First train in same
position as in "A," second train at the fourth home signal in
the rear; at this point both the home and distant signals are
clear, and the distance between the trains is now the clear
running distance; that is, when the trains are one block
section plus an overlap apart they can move under clear
signal, and this distance is used in determining the running
schedule. It will be noted in "C" that the first train has
the following protection: Home signals 1 and 2 in stop
position, together with the automatic stop at signal 2 in
position to stop a train, distant signal 1, 2, and 3 all at
caution, or, in other words, a train that has stopped is
always protected by two home signals in its rear, and by
three caution signals, in addition to this an automatic stop
placed at a safe stopping distance in the rear of the train.
[Illustration: ELECTRO-PNEUMATIC INTERLOCKING MACHINE ON STATION
PLATFORM]
[Illustration: SPECIAL INTERLOCKING SIGNAL CABIN SOUTH OF BROOKLYN
BRIDGE STATION]
[Sidenote: _Description
of Block
Signaling
System_]
The block signaling system as installed consists of automatic
overlapping system above described applied to the two express tracks
between City Hall and 96th Street, a distance of six and one-half
miles, or thirteen miles of track; and to the third track between 96th
and 145th Streets on the West Side branch, a distance of two and
one-half miles.
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