Control points, controlled signals and intermediate

[NW Mailing List]

I agree with Jimmy, that some are making signals more complicated than they really are.

There are 2 basic types of signal systems. Route signalling, which is primarily used in the UK, where railways and railway signalling were invented, and speed signalling, primarily used in North America. 

Norfolk Southern uses a hybrid system. Our signals can display 1) the aspect of the next and sometimes 2nd signal ahead, 2) the route to be taken ( the "diverging" aspects) and 3) the type of speed to be observed (maximum authorized speed, medium speed, restricted speed).

The engineer can then use the signal indications, along with the timetable and bulletin information, and his route knowledge to safely operate his train.

Dick Kimball
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