Designed to accommodate 3mm leds if wanted. 37 version sent by default. They can also fit other locos too.
Triang/Hornby Early Ringfield Class 37 Domino split Headcode conversion X 4
Hornby OO BR Class 25 Bo-Bo Diesel Motorised Loco Chassis - British Ringfield
Hornby OO BR Class 24 (Reworked 25) BR Green D5100 British Ringfield - Pls Read
