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Fwd: (erielack) Erie Signals - Meadville

Telephone Train Order Signals were listed in the Timetable and Signal 516-1 
 was not.  It was not a TTO but a regular automatic signal.  The only  TTO 
Signal in the vicinity of Meadville was 514-1 at westbound at Race Street  
which was controlled by the Operator-Clerk at Meadville Depot.  It was used  
to hold trains out of the yard at Meadville and keep them off of the  
crossings.
 
There are certain items that wire into a signal case: switch  protection, 
track occupancy, etc.  I have no signal background so have no  idea how this 
would be wired but if I had to guess, I would say that the signal  was wired 
as any other signal would be, but the circuit controller for the  switch 
leading into the yard would be wired differently, in this case, to allow  the 
signal to display Restricting when the shunt was broken for that switch and  
properly lined reverse.  Don't forget, the system signal shop was in  
Meadville so someone there could certainly figure it out.
 
I've seen the signal operate and I'm familiar with what it can do, but  
again, have no background in just how it was wired.

SMT


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Subject: (erielack) Erie Signals - Meadville
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STEVE:  Very interesting!  My question is, how did the automatic signal mechanism for 516-1 distinguish between a shunted circuit (say because of freight cars or a train in the block) and an open facing-point switch?  I suspect there was some special circuitry and relays attached to that one hand-throw into the yard, as to give a red-over-yellow at an automatic.  (I assume this signal wasn't manually controlled, like those telephone train order signals used at various points on the Erie, the ones with the Pennsy-like position lite signal under the color light signals). 


In theory, a red-over-staggered yellow is not in the 1964 rule book, UNLESS you consider this under Rule 297, as a defacto telephone train order signal.  That rule allows a red over yellow semaphore with number plate, indication being "take siding and when clear of main track report for instructions".   JIM GEROFSKY


Well, westbound at Meadville Yard, signal 516-1 at MP 103.39 was equipped  
to display a RESTRICTING indication when the switches were open into 
Meadville  West Yard.  This allowed the switches to remain open between trains 
and/or  allowed a yard crew to leave the switches open for the next train to 
pull into  the yard without stopping to line the route and tie up the road 
crossings in  downtown Meadville.  This was a two-arm signal with staggered 
heads,  and was equipped with a number plate (516-1).  It could display Clear,  
Approach, Approach-Medium, Stop and Proceed, and Restricting.                     
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