Hi Dan,
First, let me state that I am not well versed in other scales other than N.
It is my understanding the "car barn" houses the reversing circuitry.
From what I'm getting from your post, referring to the bumpers, I surmise the bumpers are some type of micro-switch, when made (contact), reverses the polarity. Where the circuit components are located I don't know.
Possibly under the track?
Either way...
I have used this unit;
http://www.ironpeng.com/ipe/auto_r.html
Again, for N scale, and have 2000+ hours on it trouble free.
The circuit has been used for the last 3 Christmas seasons.
Maybe an option for you?
I paid 30 USD at a show several years ago.
Good Luck.
First, let me state that I am not well versed in other scales other than N.
It is my understanding the "car barn" houses the reversing circuitry.
From what I'm getting from your post, referring to the bumpers, I surmise the bumpers are some type of micro-switch, when made (contact), reverses the polarity. Where the circuit components are located I don't know.
Possibly under the track?
Either way...
I have used this unit;
http://www.ironpeng.com/ipe/auto_r.html
Again, for N scale, and have 2000+ hours on it trouble free.
The circuit has been used for the last 3 Christmas seasons.
Maybe an option for you?
I paid 30 USD at a show several years ago.
Good Luck.