Bob, remember, the most restrictive indication applies cab signals or wayside - and can't forget the letter of the rule for Advance Appraoch and Approach Limited".....
Advance Approach - "Proceed prepared to stop at the second signal. Trains exceeding Limited Speed must begin reduction to Limited Speed as soon as engine passes the Advance Approach signal."
while an Approach Limited is simply
Approach Limited - "Proceed approaching the next signal at Limited Speed."
yes, the cab signals will both allow 45mph, however, the indications are drastically different, and if the cab signals are cut out, they mean two TOTALLY different things to the engineer. an Advance Approach, the engineer has to put the brakes on as soon as he passes the Advance Approach. an Approach Limited, the engineer only has to be at 45mph by the time he hits the next signal, and then of course, the Next Governing Signal rule could apply once the next signal is clearly visible, and might not even require the engineer to slow down at all.
On the RR, "believe nothing you hear and only half of what you see"
John, aka "JTGSHU" passed away on August 26, 2013. We honor his memory and his devotion to railroading at railroad.net.