It looks like the "wiperpairs" problem to me. Occurs in very old models (pre-TS2012 I believe) that have not been updated since
Use RW_Tools to open the loco .bin file (for each version) and search for "wiperpairs" (one word without the quotes).
If you find nothing, or only an "empty" tag, insert as follows, immediately after the tag <cControlContainerBlueprint>:
- Code: Select all
<WiperPairs>
<cControlContainerBlueprint-cWiperPair d:id="xxx"/>
</WiperPairs>
(it can read excatly like that, no need to put any specific ID in, just the xxx's is fine)
Note that this will fix your view from inside the cab, but does NOT provide you with rain being wiped from the windshield if it's raining. That is a significantly more complex process involving creating textures etc.