The really miniature 0.3mod GEARBOX kit

50:1 ratio with 1.5mm input shaft (1.2mm optional)

A high efficiency, miniature compound gearbox for some light duty applications in larger sizes (HO traction, speeders, etc.) may be suitable. The axle fit selection covers all known small scale sizes - for those few HOn3 applications with 3.0mm axle, the miniaturization of this gearbox made it necessary to build the axle integral with the axle gear (not available in HO gauge length