Bit of a quirky one, and possibly one of the shortest routes ever. In the UK, near Birmingham is a town called Stourbridge and they have a very short train shuttle, I've been on it a few times, got no idea about the train or the short route, but would make a nice little project for someone at Dovetail if they are between jobs!
I think this would be severely limited in itself but it would be great to see it as part of a bigger route- Worcester to New Street* say or a network route like Weardale and Teesdale in TS. (Someone was having a go at making the Town line for Train Simulator set in steam days when it ran a little to a canal wharf- it looked promising but seems to have fizzled out.) Stourbridge is my home town BTW- didn't actually ride "The Dodger" very often because I lived about half way between the Town and Junction stations but I'd be happy to see it in any form. Edit. *In my day trains ran to New Street. Snow Hill now I believe but that reopened some years after I moved to Durham.