Object template 8, and CONVEYOR_PLUS_U, CONVEYOR_MINUS_V and CONVEYOR_MINUS_U for the other three directions (graphics 69, 70 and 71, templates 9 to 11). A conveyor never moves itself: it only sets its own step, two units a turn, every turn (the room builder copies no steps from the templates). What stands on it is carried by the collision code: when something lands on anything, and has no step of its own in U or V, it takes the step of the thing it has landed on (ADJ_DZ_FOR_OBJ_INTERSECT).

The same code copies the lander's Z step into the conveyor's, which is how a conveyor knows something has landed on it: this routine then beeps (HIGH_BEEP) and clears it.

Measured in the simulator in room $0D, a ring of the four: standing on graphic 68, he went up two units in V every turn.