• Small and flexible
  • Ideal for tender-mounted motors
  • Width over gearbox sides: 8.6mm
  • Motor centreline to axle (mm): 6.7 to 12.6
  • Compatable with D2 DriveStretcher

RoadRunner Compact+

Worm Bore
Gearbox Ratio
Axle Diameter
  • The combination of small proportions and flexible design makes The RoadRunner Compact+ ideal for situations where you need to keep the mechanism low and out of sight. It's perfect for motorising railcars or trams in which a horizontal motor and gearbox can be hung on an axle, crouched down below the window level.


    To avoid cutting a section from your loco boiler, a vertically-mounted motor in the firebox may be the best option. The Compact’s articulation allows the lower part of the motor to sit between the frames, creating valuable extra headroom. Alternatively, a tender-mounted motor, driving via the gearbox’s ‘remote attachment’ generally allows you to fit a much bigger motor and although 60:1 is available, the quicker speeds of 34 and 45:1 may be better suited.