That was my first thought as well, I didn't know it was existed until I was on a long cycle from Inverness to Aberdeen and could see a DMU peeking through the trees which was a welcome surprise. They have the 140001 prototype although sadly it doesn't look like it's going to be moving any time soon, if ever.
John
Believe it or not, there is a group trying to slowly bring it back to operational condition. Spares are a bit of a problem I think though. I know one of the class 141s is likely to never work fully again because of a serious defect in a gear box for which very few spares are available - I’d imagine the 140 would be similar, especially as it’s unique!