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| Re: Old LIRR Rockaway Beach Branch (1252823) | |||
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Re: Old LIRR Rockaway Beach Branch |
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Posted by SelkirkTMO on Thu Oct 10 15:50:06 2013, in response to Re: Old LIRR Rockaway Beach Branch, posted by Stephen Bauman on Thu Oct 10 12:35:13 2013. I'll go with where Randy went, and simply add that keying by was never intended to improve service, it was a means of maintaining service. It allowed a train following the train which keyed by the opportunity to platform at the station behind that train. If you're in a position of keying by in order to close in on your leader, the railroad is already jacked up or your signals ahead would be clear for you.Keying by is also necessary when there's a bad track circuit ahead and you're presented with a red with the tracks ahead actually clear. So in this case, it would help service by allowing it to run at all. In my case, I'm thinking of a common keyby location, leaving 7th Avenue northbound into 59/CC for instance. If the train ahead of you on the ramp to 59/CC is already moving, keying by (with permission) at the exit of 7th Avenue N/B allows you to clear the stop, work your way up the ramp where you'd be held anyway, and permit the train behind you to enter 7th Avenue. Another spot was Parkside Place on the Brighton N/B where trains were merging to head towards DeKalb. But normally, keying by was done where there was a red automatic with tracks clear ahead of it due to a signal or track circuit problem. |
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