I do think it is more to do with attitude rather than ability. I think some instructors probably think if they have someone who has come from driving steam locos on a heritage railway that they are going to come along and not think they need much instruction. I can only think that this has come from bad experiences. I have never driven on a heritage railway so I dont know how much different it is from the mainline. I just know they dont have AWS/TPWS and all the interlock and passcom systems. I suppose if a trainee had had previous experience driving on heritage railways but came on a mainline course with totally clear mindset that it is totally different then it would be fine. The only thing I can see is the fact that you do not need to pass OPC tests to drive on a heritage railway (or at least I think you dont) so saying that you can drive a steam loco on a preserved line doesnt automatically mean that you can drive an EMU at 100mph.