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.

The Dapol model is of a coupled pair of wagons and has the following features:

Twin wagon set complete with coupling bar

Finely moulded body with many separately added details

Finely applied livery with accurately printed detail

Profiled wheels

NEM pockets with self-centring couplings