I've done a bit more work on my 72xx, steps have been added, vacuum pipes, smoke box door and a coupling loop. So I thought it was time to see if it would pull anything. So it went back to Hinton Parva tonight, I borrowed the coal rake normally pulled by one of the two Garretts at exhibition and off it went.
It seemed to manage with the 68 loaded coal trucks, but did have a bit of wheel slip if not driven with care. Still a bit more work to do before it is ready for painting, but it is getting closer.