O cavalo está no meio do veículo e corre sobre um aro.

Será que tem algum isolamento contra odores?

Texto original da patente: A road vehicle is driven by animal powered drive means comprising an endless conveyor belt (34) acting as a tread-mill and driving the vehicle drive wheels through a chain (44), a clutch (49), and a variable-ratio gearbox (46). The belt is centered on the longitudinal centre line of the vehicle below an enclosure for the animal, driver and passenger spaces being on either side of the enclosure. The animal is supported by harness including a collar (76), trace (77), a back strap (80), girth (79) and a breeching block (84). Containers are provided to collect droppings. GB2060081