I have not seen it mentioned on here, but there is a new version of Serz.exe in TS2014 - new features are:-
1. This version requires 2 extra .dlls to run it, so if you use it in RW_Tools, you also need the files stlport_vc10.5.2.dll and zlibwapi.dll from the RailWorks folder to be in the same folder as serz.exe
2. The new version handles textures up to 4096*4096 pixels
3. It also handles the .geopcdx files for all of the locomotives I have tried so far - the earlier versions would open, but not recompress large .geopcdx files such as those for locos and large models such as some stations.
Mike