Thanks for the reply and for info these are steam with 5 pole motors and as I have 10 of them it would be a bit expensive to replace them all which was why I planned to add decoders. I was looking at using the digihat as these look the easiest to install and I appreciate these will probably never run as well as a purpose built DCC model but thought it may be worth trying to update them. I also have a couple of DCC ready Dapol steamers so my only other options would be to go down the DC route with the old kit and build a separate DCC layout ( even more expensive) or sell the old kit.