I have mentioned elsewhere (https://forums.dovetailgames.com/threads/ntp-inappropriate-routing-signals-and-speed-limits.20295/) about trains being routed inappropriately through Huddersfield with the very strong suspician that the up line to down line crossover for access to the shunting line is signalled incorrectly. I have also had doubts about just how many non-passenger trains are routed through the down loop, outside platform 8. However, I now find that this route is not correctly signalled at all, or rather, the down direction signals for exiting the station are not correctly interlocked. The last signal controlling the exit from the down loop to the down main at the north end of the station is HU115, shown on the right in this screenshot. The train alongside is 6E36 Stalybridge - Healey Mills, waiting between turns. As you can see, it is stopped well beyond the signal. It needs to stop this far forward for the rear of the train to clear the main line, although I guess from its being well beyond the platform 8 up starter that it is sat on the track circuit protecting the entrance to the station in the down direction: It should be clear that, even accepting that the rear of the train is clear of the down line into platform 4, that no train can exit any platform road in the down direction with 6E36 stopped beyond HU115, yet 6E36 is stopped here precisely to allow the 11:48 MirfieldMarsden - Leeds DMU to overtake it. This is completely unnecessary of course; the sensible thing would have been to hold 6E36 at Marsden and let the DMU out in front, but if 6E36 is allowed to run in front of the DMU at Marsden, it may as well do so all the way to Heaton Lodge, where the two trains take different routes. However, that is by the by. What the game does is have the DMU overtake the oil train in Huddersfield station, and the platform 4 down starter HU97 is duly cleared for the DMU even though the route is not protected from 6E36 in the loop. This is a train sim - it says so in the title - so I expect a certain level of immersion and as accurate a reflection of the prototype as can be done with a game. I expect the trains to behave like real trains and the signalling to work like real signalling. Most of all, I expect the physics to match the real world, and if you are going to let us crash 133-ton class 40s into the sides of 32-ton DMUs then make it so that the DMU derails, not the class 40, eh? Seriously, please take a good look at Huddersfield station signalling and the routing of trains through the station. I cannot help think that there has been a shunting signal omitted on the down loop beyond HU115 - there is certainly room for one in line with or even beyond HU84 on the shunting line. However, I have no idea what actual signalling there was at the time, and perhaps the game shows the signals accurately. If you do have to loop the oll train to allow the DMU to overtake, this could be done perfectly safely by taking it up the shunting line as you do for the down TPO.