Cheers for the info, ballast wagons without having to buy the ratio kit, fantastic
On a brief glance in the wagons book you are spot in that they just chopped the ends off and added buffers, so conversions should be possible. I think the LNWR had an extension to the allowed conversion timeframe due to the shear number of wagons they had to convert, so it would be quite feasible to see both variants on the network, though wether you would see a train of mixed units, i.e. a 3 set sprung-dumb-sprung buffered I'm not sure