Monomotor

A monomotor is a train design where a single motor powers two axles in the same bogie.

Conventional bogie design involves either having one motor for each axle, or having one or more axles unpowered. The design causes the motor to give both axles the same number of rounds per minute. When both axle's wheels are equally worn, this gives good operating conditions. But as soon as one of the wheels becomes slightly more worn (as is inevitable with steel on rail wheels), the one axle will perform all the work. This causes sliding and increases the wear. The problem can be countered by keeping the wheels regularly grinded to the same thickness.^[1]

References

1. ^ Andersen, Bjørn (1990) (in Norwegian). Gullfiskene: Oslos strømlinjede aluminiumvogner. Oslo: Lokaltrafikkhistorisk Forening. pp. 32.