For some unfathomable reason I was led to the site for this despatching program, which, from what I understand, is the modern version of (but not directly related to) Train Dispatcher.

I had never heard of it until I wandered into the website. After reading about it I downloaded the core program and one "location" - Inverness, Scotland, noted as a gentle introduction to TD3.

And it is.
Sitting back with a scotch and soda, routing little trains between Perth, Inverness and Wick, it makes for quite a calming activity after a stressful day (health issues ).

There are many routes to download - some look quite intensive - and everything is free.

https://www.backerstreet.com/traindir/en/trdireng.php