By its very nature such friction on the axle creates drag and therefore reduces the number of coaches that can be pulled behind a locomotive. The Maglight system consists of an LCD strip, small button battery and a reed switch.
Hornby R7338 Maglight for 4/6 Wheeled Coaches OO Gauge
Hornby R7338 Maglight Lighting for 4/6 Wheeled Coaches
R7338 Hornby OO Gauge (1:76 Scale) Maglight for 4/6 Wheeled Coaches New Tooling