The object and accompanying animations for Lara are in the TEN base WAD, which comes with the general TEN download package.
The animating object used as the switch has been replaced with a dedicated MINECART_SWITCH object (also in the base wad). To use this: place a HEAVY trigger underneath the switch and it will trigger this when it is hit with the wrench if Lara is riding in the minecart.
New graphic elements were added for water wakes and ripples if rode through shallow water.