TRS2019 and ECML routes: frequent random freezes

Hi.
As per title those routes are not playable on my system. General problem or local problem? Where and how should I investigate?
TNX for any help.
Simon

1. Specify the route and session KUIDs so others can check they are running the same version.
2. Does it happen in Surveyor and Driver? Same locations?
3. Try different performance settings to see if it occurs only at specific settings.
4. Try PhysX off
5. Try debug mode and "Suspend... X" where X is scenery, splines, speedtrees, or some combination of those.

Debug = Trainz Settings > Dev tab > Enable advanced debug tools
Then restart the game.
Then Trainz Settings > Developer menu > Suspend... > Choose something to suspend.

Thanks for helping, Tony.

(The Flying Scotsman - from Kings Cross to Edinburgh)
After some testing and counter-testing the problem seems to be the PhysX option. Without, works like a charm.
Thanks again. Simon