BNSF Seligman Route PSC Physics Overhaul

This is a complete engine and wagon physics replacement for the OpenRails version of the TrainSimulations BNSF Seligman Route. Updates all locomotives and rolling stock to use highly detailed physics made with the most recent builds of OpenRails in mind. Does not overwrite any original files, making heavy use of include (.inc) files. Compatible with OpenRails v1.6 or newer (including testing, unstable, and NewYear MG versions).

PSC physics overhauls are modifications that seek to enhance the experience of MSTS and OpenRails content by completely re-implementing engines and wagons from the ground up. Years of research and the newest OpenRails features (sometimes features I have implemented myself) are used to their fullest extent to create the most accurate, and most obsessively detailed, driving experience possible. For classic MSTS routes, this means substantially increased compatibility with OpenRails and much more realistic physics. Newer routes aren't left out though, as physics tweaks can subtly improve realism above the original and the addition of new features prevents content from going stale. And extensive use of "include" files allows for consistent, shared behavior across years of content and trivializes adding new OpenRails features, all without touching any original files.