Sources:
B&O, C&O Operating Rules, 1969
The Pennsylvania Railroad Book of Rules, 1956
"o" = short sound
"-" = long sound
"_" = sustained sound
o Apply brakes. Stop.
-- Release brakes. Proceed.
-ooo Flagman protect rear of train.
-ooo- Flagman protect adjacent track
---- Eastward or Northward trains recall flagman.
----- Westward or Southward trains recall flagman.
oo Answer to any signal nor otherwise provided for.
ooo When standing - back. When running - stop at next Passenger Station.
oo____ Answer to flagman's stop signals.
oooo Call for signals.
--o______ Approaching public grade crossings at grade. To be prolonged or repeated until crossing is reached
_______ Approaching stations, junctions, and railroad crossings at grade.
o______ Inspect train line for leak or brakes sticking.
succesion
of o's Alarm for persons or livestock on the track.
____o When running on left hand track of a two track section:
(1) Approaching stations, curves, or other points where view may be obscured;
(2) Approaching passenger or freight trains and when passing freight trains.
o____ ____Acknowledge train order signal displayed for orders.
o-- To call attention of operator on last block station before reaching point where stop is to be made for such purpose as man be provided in the time-table.
-----o Westward or Southward trains recall Flagman on No. 1 track.
----o Eastward or Northward trains recall Flagman on No. 1 track.
-----oo Westward or Southward trains recall Flagman on No. 2 track.
----oo Eastward of Northward trains recall Flagman on No. 2 track.
-----ooo Westward or Southward trains recall Flagman on No. 3 track.
----ooo Eastward or Northward trains recall Flagman on No. 3 track.
-----oooo Westward or Southward trains recall Flagman on No. 4 track.
----oooo Eastward of Northward trains recall Flagman on No. 4 track.
