Having tiled everything tile-able on the layout in between reloads, I've now got the ED to the point where I'm happy with the diesel flowchart, the electric flowchart and all the auxiliaries (compressor, horns etc). Next comes the tricky bit; how to program the changeover from diesel to electric and visa-versa, whilst maintaining authenticity and staying within the technical constraints of the chip. I'm not anticipating this to take too long but the annual sojourn to Model Rail Scotland is going to intervene. All being well I'll be picking up a banger blue Lima 73 while I'm there. Normal service will be resumed as soon as possible...