Hello guys:  hope everyone is having a pleasant summer fishing or whatever.

I got a call from a reader who is having trouble using AF semaphores to
operate two trains at once on long loops.  He says that the AF pressure
trips don't work well, and has tried all the right things as far as I can
tell, adjusting them, cleaning the contacts, not nailing down the track
near the trips, and placing cardboard under the discs.

Has anyone on this list gotten this system to work well?  If so, could you
post descriptions, advice, and suggestions for him?  He is not
computerized, so I will print out any helpful postings and mail them to
him.  Are the AF electric track trips better?  Has anyone used Erie Signal
or Dallee trips for this successfully?  How about the MTH pressure trips
and ITAD's?  What is the key to the correct placement of the trips?  etc,
etc.  I know that some of you guys have some good answers.  Please pitch in
here.

I never liked this system too much, and so haven't much experience with it.

Incidentally, I am working on a system that will allow several trains to
occupy one loop without colliding.  It is based on the old block system in
the Lionel Fawcett paperback.  The key for this system is to divide the
loop into three blocks to run two trains.  For three trains you would need
four blocks, for four you would need at least five blocks, etc.  No
semaphores involved.  I have gotten it to work well with two trains, but
need more accurate train detection devices to make more than two train
operation work.  I hope to set it up on the floor, tinker with it until it
works, and then publish it in S Gaugian. It ought to be fun and useful too.
Any suggestions?

Thanks.

Tom Jarcho



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