THERE ARE TWO PIECES IN THIS SALE
Marklin K-track #2129 Circuit-control curved tracks
Excellent condition with boxes & instructions

Both pieces have the original box and instructions.    Radius = R360
Both boxes are in good to fair condition - the side flaps are loose
The instruction sheet paper is slightly brown - but they were never opened.

These tracks activate when the locomotive center-rail slider presses and activates a switch to close a circuit - that action can activate a switch or a signal. These are from the 1990's and appear to have never been used.  Hollow-formed nickel-silver rails may need to be polished. 
There may be a few spots of minor rust that need to be removed.  Please see the closeup pictures.

Shipping is by USPS 1st class mail - postage INCLUDED in the sale