AUTOMATIC BLOCK SIGNAL RULES FOR ENGINEMEN AND TRAINMEN.
RULE 800A - Home Signals
COLOR	RED.
OCCASION FOR USE	Block is not clear.
INDICATION	Stop.
NAME	Stop Signal.
RULE 800B - Home Signals
COLOR	GREEN
OCCASION FOR USE	Block is clear.
INDICATION	Proceed
NAME	Clear signal.
RULE 800C - Distant Signals
COLOR	YELLOW.
OCCASION FOR USE	Home signal or signals in advance at stop or track obstucted between home and distant signals.
INDICATION	Proceed with caution to the home signal.
NAME	Caution signal.
RULE 800D - Distant Signals
COLOR	GREEN.
OCCASION FOR USE	Home signal or signals in advance at proceed.
INDICATION	Proceed.
NAME	Clear signal.
RULE 800E - Home and Distant Signals on same Mast.
COLOR	Upper arm RED, lower arm YELLOW
OCCASION FOR USE	Block is not clear.
INDICATION	Stop.
NAME	Stop Signal.
RULE 800F - Home and Distant Signals on same Mast.
COLOR	Upper arm GREEN, lower arm YELLOW
OCCASION FOR USE	One block is clear, second block in advance is not clear.
INDICATION	Proceed through block prepared to stop.
NAME	Caution signal.
RULE 800G - Home and Distant Signals on same Mast.
COLOR	Upper arm GREEN, lower arm GREEN.
OCCASION FOR USE	Two blocks ahead are clear.
INDICATION	Proceed.
NAME	Clear Signal.