When playing this scenario there is a long line of around 10 locos all numbered 8104 in NS livery (Even though this number is one of the heritage units!!!). The locos are located on an adjacent line to the one you approach the other heritage units on and all appear to be static models. Then alongside the heritage units that you are coupling to there are two more lines of locomotives numbered 8104 which are again static models but some of which are placed below track level. When approaching these two locations where the locos are placed the fps drops dramatically to around 10fps at most. (Usually around 25-30fps with my setup). I have removed all mods from the DLC folder and reverted to a standard engine.ini file with no change at all. See below images.....
