Reed switch at centre of the table.
The overall operation is as follows: The railcar arrives at the turntable, passing over a magnet mounted just outside the actual table. This magnet closes the reed switch under the car,
which turns off the power to its motor and starts a delay timer (approx. 50secs).
Momentum carries the car onto the table, where a magnet mounted under its front axle closes a reed switch located at the centre point
of the table.