RULES FOR THE OPERATION AND MAINTENANCE OF INTERLOCKING PLANTS ENGINEMEN AND TRAINMEN
RULE 900A - Home Signals
COLOR	RED.
OCCASION FOR USE	Route is not clear.
INDICATION	Stop.
NAME	Stop signal.
RULE 900B - Home Signals
COLOR	GREEN
OCCASION FOR USE	Route is clear.
INDICATION	Proceed
NAME	Clear signal.
RULE 900C - Home Signals
COLOR	RED.
OCCASION FOR USE	Route is not clear.
INDICATION	Stop.
NAME	Stop signal.
RULE 900D - Home Signals
COLOR	Upper arm GREEN, lower arm RED.
OCCASION FOR USE	Main or high speed route clear.
INDICATION	Proceed.
NAME	Clear signal.
RULE 900E - Home Signals.
COLOR	Upper arm RED, lower arm GREEN.
OCCASION FOR USE	Diverging or slow route clear.
INDICATION	Proceed at slow speed.
NAME	Clear signal (slow speed).
RULE 900F - Home Signals.
When there are three arms(home signals) on the same mast, they will govern as follows:
Upper arm main or high speed route.
Middle arm route of next importance.
Lower arm diverging or slow speed route.