I discovered a typo in the Caboose_NW.bin for the NW Caboose that came as a bundled freight car with the RSC Norfolk Southern SD45 High Hoods Loco Add-On DLC. The Caboose_NW.bin has a incorrect value for the <RearCouplingPivot><cHcRMatrix4x4><Element> - code line 15 of that element matrix. The error incorrectly causes the rear coupler object "coupler_ms.xml" to be placed at the front-end position on the caboose instead of the rear position.
I attach a code snippet showing where the error occurs. Note the RED highlighted line.
I changed the "sign" of the 5.375 meters value to -5.375 meters and that seems to have fixed the issue. The line of code can be edited in RW_Tools to the correct value.
OlPaint