Steam truck

These Steam trucks were a type of vehicle developed after the war for the Master's Unity. Little is known about them, except for the fact that they were used in the attack on Necropolis.

Behind the scenes
"I have no idea how the Master was moved. It was probably either by a large (steam) truck or caravan, but I don't have any specific information on how he was moved. I doubt a caravan could do it unless Grey was much smaller and, uh, less "spread out" than he was at the end of Fallout 1, which is entirely possible, but he sounded pretty fucking mutated in his audio diary in the Military Base. Maybe they poured him into in a toxic waste barrel and transported him that way."


 * The above quote comes from the Fallout Bible, where Chris Avellone speculated that the Master was transported from Mariposa to the Vault using such a truck.