In order to switch your cars in a proper way you have to uncouple the cars in a proper way.
The introduction of magnetic uncoupling by Kadee was a major breakthrough utilizing magnetic force to activate the coupler. Now it was possible to spot cars at any desired location on any track beyond a magnetic uncoupler.
Delayed magnetic uncoupling is a unique way of dropping a car, or cars, at any number of locations using only some magnetic uncouplers on specific spots.
By the rules of the timesaver the magnets has to be positioned on specific places (the blue dots), as you can see in the image below.
First I cut out a piece of wood, mount the uncoupler (magnet) and then put a piece of painters-tape over it. Later on I can ballast the track with no problem