Model of one of the British war department light railway wagons used in WW1. They started with small 4 wheelers such as this A class, but soon moved onto bigger bogie wagons. Recommend either Romford 10.5mm diameter OO wheels or Lilliput 10.7mm wheels. The Romford wheels have longer axles being OO, so each might need slight modification to axle bearings. Chassis provided with NEM pockets. I have tested Bachmann/Liliput Ho couplings, and Bachmann OO couplings but not sure about Kadee for height.