MODEL TRAINS short story

Paul McGann reads this and two other stories I think. They are from the SHORT TRIPS earlier tales. I think it's  a quaint small story of the Doctor playing with model trains. There's more to it than that though. I think there are tiny aliens, clockwork passengers in the train and there's a link to the 7th Doctor's manipulations that just aren't the 8th Doc anymore and even he realizes that. A good tight little story that just about works