Hello, I'm wondering if it would be possible to replicate the old Airfix Motorized wagons? What modifications would I have to do to a Boxvan By Dapol to get it to move under its own power? Also would I have to weigh the Dapol Locomotives down, by How much? I'm Looking to get another Pug eventually by Dapol and I want it to eventually be pushed by a powered wagon, any suggestions are welcomed! Thanks!