A big thank you to Buzz who had found and fixed the problem before i'd even got home from work
A couple of lines in the bin are pointing to the beta model so it's messed it up for you guys that don't have that.
If you can't wait for the fix to be uploaded you can change the bin yourself.
look for these lines;
<BlueprintID d:type="cDeltaString">Freight\TTUXFrontrunner\Bogey.xml</BlueprintID>
<GeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\Freight\TTUXFrontrunner\[00]Frontrunner</GeometryID>
<CollisionGeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\TTUXFrontrunner\[00]Frontrunner</CollisionGeometryID>
and change them to the wagons number.
Unloaded example;
<BlueprintID d:type="cDeltaString">Freight\TTOXFrontrunner121073\Bogey.xml</BlueprintID>
<GeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\Freight\TTOXFrontrunner121073\[00]Frontrunner</GeometryID>
<CollisionGeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\TTOXFrontrunner121073\[00]Frontrunner</CollisionGeometryID>
Loaded example;
<BlueprintID d:type="cDeltaString">Freight\TTOXFrontrunner121073 Loaded\Bogey.xml</BlueprintID>
<GeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\Freight\TTOXFrontrunner121073 Loaded\[00]Frontrunner</GeometryID>
<CollisionGeometryID d:type="cDeltaString">thebigroyboyski\RailVehicles\TTOXFrontrunner121073 Loaded\[00]Frontrunner</CollisionGeometryID>
Sorry for the problem everyone.
Once the fix is uploaded I'll let you know.
Roy