When DCS Loses Power, Then regains power?

That won't work under DCS. However, you could do what you desire by using the Record/Playback process:

• Press Startup and drive the train to where you want it to be when it starts running its loop
• Stop the train by reducing speed to zero. Do not change direction.
• Press Menu/Advanced/Record Playback and soft key REC. An "(R)" will appear in the DCS Remote's window
• Press Startup again and drive the train into the tunnel
• Reduce speed to zero
• Wait as long as you want the train to be in the tunnel
• Increase speed to what it previously was
• Drive the train back to its initial starting point, reducing speed to zero so that it stops as close to it's initial starting point as possible
• Press Menu and soft key STP
• Press soft key SAV and select a Session# to which to save the session
• Press the thumbwheel to save it.

To playback the session:

• Position the train at its starting point
• Press Menu/Advanced/Record-Playback and soft key PLY to play the recording once or soft key LOP to loop the recording until you manually stop it. A "(P)" will appear in the DCS Remote's window
• Select the Session # you saved the recording in previously.

This and a whole lot more is all in "The DCS O Gauge Companion 2nd Edition", now available for purchase as an eBook or a printed book from MTH's web store site! Click on the link below to go to MTH's web page for the book!

 

http://www.mthtrains.com/content/60-1279

 

That's awesome Barry, thanks.  Much easier in the end than what I would have done with DCC.

I will be purchasing the book this week as my DCS system is on it's way.  I mainly wanted to answer a question for myself when thinking about the design of my layout before I got too far with ideas.

The book covers Record/Playback in considerably more detail than I did above. By experimenting a bit, I feel certain that you'll be able to achieve your objective.

It is theoretically possible to have track voltage be dropped to a point where motor can't run but PS2 will think power is still on.  This would be hard on the motor, probably causing it to overheat when stalled.  This theoretically could be overcome by placing a relay between PS2 board and motor, set to drop out at, say, 10 volts & pull in when full voltage is restored.  The coil would have to be fed track voltage, not voltage from the motor circuit.

This is all theoretical, a possible idea for someone wants to play with the system.  I have used such relays many decades ago, to pull in a SPDT relay when 20 volts applied to track, to trigger an e-unit while disconnecting the motor to avoid a lurch.