You can see a red 'sled' is attached to a loop of cable (with a pulley behind it)
The sled runs down the middle of the track, with the underside of the train hooking onto it.
You can see a red 'sled' is attached to a loop of cable (with a pulley behind it)
The sled runs down the middle of the track, with the underside of the train hooking onto it.