Automatic reversing

@Rockershovel,

Here are two possibilities.  I'm sure that there are more:

1.)  Z-Stuff DZ-1240 Auto Stop & Reverse Module -- Newer vintage; should still be in production

2. ) Pocono Mountain Lines AC Auto Reverse Unit -- Older vintage so it may be had to find.

Both of these also offer programmable intermediate stops.

Mike

If you are looking for one-and-done then by all means get a purpose-built reversing controller as Mike suggests.

OTOH if you are game for DIY tinkering, you can cobble together something using relay timer modules.  For example, this was discussed in this OGR thread.  This defines the problem as a widget that momentarily interrupts track power for, say, 1 second (to put the loco in neutral) ... then waits a few seconds ... then interrupts track power again for 1 second (to restart the loco in other direction).  This sequence would be triggered when the loco reaches either end. 

The timer module referred to in the linked thread is widely available.

There would be no bells and whistles like the DZ-1240 which appears to be about $60.

I'd think it could be done for $10-20; I only suggest this to those that see this kind of messing around as part of the fun of the hobby.

For the persistent DIY'er with a limited budget, using aforementioned timer relay module.

If willing to wait for shipping from Asia, the widely-available relay module can be had for about $3.  Pretty amazing.

This timer module can be used for other layout antics such as emulating the #132 Station-Stop. 

There are i's to dot and t's to cross such as you need a DC-output wall-wart adapter to power the timer module...though any self-respecting DIY'er will have a box (or two) of said items in the garage or attic.

stab2004:

You opened my eyes!!!  I bought one of those 2 years ago to stop and start a ferris wheel.  Worked well.

I never thought of usiing it in the way that you exampled here.  I bet I can find a use for it.

THANKS

walt