The way I think this set works is this:
Percy stops and the truck tips the barrel into the elevator entrance, the traction from his wheels spun a mechanism that made the barrel roll up to the top, then it rolls back down into the truck.
Tons of Trackmasters once said this set may have had a mechanical flaw as the reson for it never being released.
Perhaps the barrel would get stuck in the elevator or the barrel would just fall out of the truck instead of going into the hole like it is supposed to. Who knows
Percy stops and the truck tips the barrel into the elevator entrance, the traction from his wheels spun a mechanism that made the barrel roll up to the top, then it rolls back down into the truck.
Tons of Trackmasters once said this set may have had a mechanical flaw as the reson for it never being released.
Perhaps the barrel would get stuck in the elevator or the barrel would just fall out of the truck instead of going into the hole like it is supposed to. Who knows
Train it, plane it, you name it!