Going back to what the visitors to preserved railways want/expect. I work on the Mid Hants and although we don't have a real diesel following we do use the DMU a lot. I have noticed that more people want to ride in it than used to be the case, with many of them saying that they used to travel to school in similar units. Some of the small children don't like the steam engines and can upset dad or granddad by wanting to ride behind the diesel when we have had a steam failure.
As a five year old I hated diesels with a passion but now fifty years later I enjoy my days as Conductor Guard on the DMU. Funny how time changes your views!
Chris