TANE SP4 Beta saves a route as 4.5.
TRS19 SP1 (105096) saves a route as 4.6.
TRS19 SP1 (105100) saves a route as 4.6.
I'm confused why I have two different Version Builds of 105096 and 105100. I'm sure I bought a copy on the original release that I suspect is now 105096, The 105100 version, that I describe as the Gold Version, came with the subscription. The latter is my "play" and asset dev version.
I'm not bothering to update any DLC on the 105096 version as I only use it for CRG purposes. If I drop my Gold membership then 2/3rds of the DLC will become invalid anyway.
Getting back to the original question posed by Deane, and I don't know his thoughts behind that question, this might be useful:
1. TRS19 (whatever) is asset Trainz-Build 4.6 and any new assets I make will be for that version.
2. For TB 4.6 you can:
a. Import FBX files which get converted to Trainzmesh.
b. Import IM files.
c. Use the old materials (tbumpxxx, etc) for either IM or FBX.
d. Use the PBR materials only with FBX.
e. You can mix IM and FBX, and new and old materials in the same model.
Other:
I think there is a bug with scenery assets using mesh-table LOD, built with TB 4.5, and used in TRS19 SP1. Some of my test assets will not show the high poly mesh version. The easy fix is to bump the TB to 4.6 and add the, now compulsory, mesh-table-lod-transition-distances tag.
There is also something weird in the CM asset validation. Some assets, on commit, will show as faulty but checking errors and warnings shows none. If you then use Preview Asset then Trainz suddenly decides its not faulty. I've had a discussion with the N3V QA about this and he had already observed this issue.
Apologies if I have drifted too far off the original question.