This bug seems to be rather new. Every single SW train has this issue where the main body part is slightly shifted upwards. And when I say every train I mean EVERY train is affected by this, but the only one that doesn't seem to be affected is the Mini Trains. If I recall, there was a similar bug that occurred back when the SW Base was released, where both the Old and New X12 trains front car was heavily shifted upwards (not sure if you guys remember that). So this seems to be a returning bug. I've done a couple tests and found out that trains that don't have bogies can't be driven at all. Since their body is shifted upwards, that means the wheels are shifted upwards enough to a point where they aren't touching the rails and therefore preventing the trains from driving. Like I said, this only happens to trains that don't have bogies. Trains that do have bogies such as the Ludmilla, the Rail Car pack, and the T-7 pack such as the long T-7 passenger cars are able to drive just fine, but the shifted bodies are still noticeable as seen from the screenshots I have taken and showcased below. And yes I've taken a screenshot of every single train to show you that all of them are being affected by this issue. To show you how I noticed this bug, you'll see in the screenshots that the trains without bogies are lifted up a bit and are not the touching the rails, ones with doors are slightly sunken into the main body part which reveals a gap above them, and ones with bogies show that the bogies aren't making contact with the main body part and look like they aren't attached as shown by a gap between them.

Diesel Ludmilla:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902274
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902403

Automated Tram:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902467
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902549

Crane Train:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902738

Diesel Henschel:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397902919
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397903098

T-7 V1 Loco:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397903193

T-7 V2 Loco:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397903619

T-7 Short Car:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397903864
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397903751

T-7 Long Car:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904003
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904164

ST-3 Tram:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904295
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904442

Note: The ST-3 Tram is lifted but it's not lifted to a degree where it can't drive. It's still drivable.


Passenger Car from the Rail Car pack:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904744
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904849

Boxcar Car from the Rail Car pack:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904959
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397905079

Car Carrier from the Rail Car pack:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397905254
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397905401

Note: Although the Car Carrier has no doors, the extendable platforms are slightly lowered instead of being in the center.


Tram:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906108
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906196

New X12:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906344
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906473

Old X12:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906607
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906713

Western Steam Loco and Tender:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397906853
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397907015

Western Passenger Car:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397907120
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397907267

Western Caboose Car:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397907459
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397907596

Wuppertal Suspension Train:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3397904545


I'm am aware that if an issue like this occurs, I should be looking at the troubleshooting guides. But the reason I'm reporting this is because I want to make sure if anyone else is able to replicate this and to make sure that I'm not the only one experiencing this issue. If not, then this is an issue on my end (such as a conflicting addon) and I'll do my best to figure out what's causing it.