Alec,
It's not as easy as that. The Murchison 2 in TS12 61838 (SP1 HF4) is done in packages not unlike the DLC content we use today. The content is highly compressed and will not import directly and will have all kinds of errors. Exporting the content won't work either due to the copy-protection for these assets.
If you have the TRS2009 version, however, you can with a really, really lot of work, export the routes and content. Once imported into TRS19, however, you will need to do many, many repairs on all content. The errors are relatively easy, but there are hundreds of them. If you do use this method, you need to export in batches, otherwise, you'll end up missing something or worse end up absolutely confused due to the shear number of assets.
Fixed junction assets need replacing because the track, by default, uses the built-in procedural track, and these fixed-junction assets are not quite up to par anymore, let alone that they may not work properly anymore. I didn't spend too much time trying to find out with those. This track now creates its own ball of wax because there will be some, not a whole lot, of faulty junctions which require fiddling due to uneven terrain, or too tight a radius for the rails
Once imported there are tons, upon tons of cosmetic things that need repairs. It's not that Mike didn't do a wonderful job with the route. He did a fabulous job with the assets of the times and sadly the route looks like it is from the TRS2009 days. The good news is he is working on the route, although, as you can tell it's a very, very long process to ensure that everything is up to the current standards that he and the rest of us expect to see in TRS2019.
