4F-025-012 MJA Freightliner Heavy Haul Bogie Box Van 502039 & 040 Twin Set The MJA bogie ballast wagon was introduced in 2003 and was built by Wagony Swidnica in Poland and operated exclusively by Freightliner Heavy Haul Limited. The primary use of the wagon is for the carrying of stone, minerals and other aggregates. The wagons operated almost always in pairs with buffers at one end and the other end bar coupled to the twin wagon. The wagon is still used widely today including Mountsorrel to Luton and from Croft to Harwich. Scale 1:76, OO gauge