It's been talked about before. Chris and Atari had an incident that made Chris leave taking the rights to modify the exe with him.
it's believed that Sawyer still owns the original IP to the game series.
Right I have been doing some digging at TESS ( US Trademark Electronic Search System ) and found out the following.
Atari, 469 trademarks listed, Locomotion is not shown amongst them
CS, 3 trademarks listed , two for Rollercoaster Tycoon, 1 for Transport Tycoon
Info games has two, Microprose and Falcon
Microprose, 109 records
In short if CS does own the rights to Locomotion it was not trademarked in the US at that time under that mark and also the UK trademark office does not show any entry for Locomotion registered to Atari Europe S.A.S.U
In short the bit about all of the trademarks being the property of their respective owners seems to be a misnomer in this case
If Locomotion is not going to get any official support from Atari or CS maybe we should now finally push for it to be made open source. That way we can edit out the bugs that we know exist in the game and can improve it with official sanction to make it more user friendly and reliable.
Before you say I am going off topic Badger what I was trying to say is that CS is independently very wealthy from the RTC series by all accounts and this game probably hasn't crossed the consciousness of his management company for several years except when they were asked to allow the long station patch, etc to be developed.