Other possible (elimination) tests:
-use another panto temp
-use another bogey temp
-remove your highest lod temp (adjust lm)
Tested here many times, the .lm.txt file does not exact what you write in there
FI: lets say you have a loco with, 2 bogey, 2 wipers, 2 fans
from these 6 attachments only 1 gets removed with the "attachmentCutoff = ?,?"
thereby for me impossible to get below 500 poly often.
Passengers only go at around 1km, no idea about the driver, the viewer don't show it
which means the viewer is not exact like the game.
Then the effect of cache in a session, there is no guarantee, if you change anything on your content
then play the session again all new things are implemented,
Which means, its best to completely remove it from session then place again after changes.
hope you find it
greetings GM