Basically, it creates traditional looking track diagrams from MSTS routes - using the track database. Its really a tool I'm developing to help me spot track laying issues that AE/RE don't indicate ( or are inconsisent with). I also wanted a way of producing track diagrams without having to resort to manual tracing from books. Its a tad slow on a very large route, but I'm working on ways to improve that - though for most routes its actually about the same speed as AE for scrolling/panning.
Initially it will be just a viewing tool, but I do want to look into the possibility of editing track paths (or even track layouts), and editing of object/interactive parameters. It would be nice to be able to join two slightly mismatched track ends, for example. I also want to add a scratch area for testing shapes or track layouts in safety - ie. work out the exact layout precisely, without even launching RE.
Plus, I want the signals to be configurable, so that each signal type can display a more appropriate image - eg. ground disc, or bracket signals. It would make the diagram more realistic, and help drivers to learn the signals.
Although its been designed with UKFS in mind, its not going to have anything specific to UKFS - so it will be possible to integrate other track systems, for things like colour coding.
A demo should be released with the next few days
and is going to be so useful for a 'little' 
signalling project coming up... 
, that's real cool Tim.
