Does it have to slow down at both ends, or can it just stop and reverse?
More expensive if it has to slow down first, doable either way.
Slowing down is easier on the equipment, at least in smaller
scales but it's easy to do, doesn't have to be expensive.
Put in a couple of gaps at each end, put a resistor in series
with the track feeder in each block.
You will have to determine the values by experimenting
of course. They will depend on how much current the
engine draws which will determine not only the resistance
but the wattage but if all you want is to cut the speed
some, not have a gradual "ramp down" of speed it's not
a big deal.
Our club has an automatic loop-to-loop circuit we run
during our open house in the fall fair. A train breaks
a photocell which cuts in a resistor, then it hits a
second photocell which turns off the track power
altogether. We use solid state throttles and this
sort of thing is simple to add.
It's a commercial package for the auto-reverser but
I can't recall who made it. There are several on the
market however. See the Walthers catalog for
Can someone tell me the current and voltage required for these