Denny D’s Did You Know - Automatic Interlockings

It’s nice that the next governing signal was recently brought back. With that being said, it’s important not to to forget GCOR 9.9.1 - Approach to Automatic Interlocking. Rule 9.8 and PTC do not have an exception when delayed approaching an automatic interlocking. 

GCOR 9.9.1 applies at interlockings with an (A) symbol and also those with a (Z) symbol in the station column of the timetable.

If you are below 25 MPH passing the signal prior to these interlockings or drop below 25 MPH after passing the signal prior, you must be prepared to stop until you are within 1,000 feet of the interlocking. There a a few exceptions in the St. Louis Timetable. One exception would be approaching Tuscola on the Pana Subdivision. The signal that this rule applies to is actually a few signals before the interlocking in both directions. 

Don’t let your PTC screen or even seeing the signal with your own two eyes lure you into a trap. If you are delayed approaching an automatic interlocking, the signal could very well timeout and drop to a stop signal until you are within 1,000 feet of it

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