After multiple descents and ascents in different weather conditions and at different times of the day, alternating at all times of the route between the two braking systems, I can assure you that I have not had any derailment. I therefore come to the conclusion that many people do not know how to use these GE 4-4 II systems. Or rather, exactly when to use each one. If there is something really fun and wonderful on this route, it is having to go down those 6% gradients with maximum concentration in a realistic way, using the dynamic brake, because otherwise if you overuse the vacuum brakes IRL you risk overheating, which would lead to a loss of braking power or even cause the brake pads to catch fire. But you can NOT use the dynamic brake at any time and also depending on the terrain and its characteristics you will have to apply a percentage in each case, there are places where you have to apply it extremely softly and others where you can apply it 100%. That is the beauty of this route, which forces you to learn the route by heart to perfection. All the gradients, all the bends and every single camber so that you can anticipate what's ahead at all times. So, I see that there are two types of users: 1- Derail twice and struggle to learn how to brake properly, appreciating that Rivet has taken the trouble to recreate the physics of gravity affecting the train and the interaction between the carriages to give us a great driving experience as close to reality as possible. 2-Derails twice and goes to the forums to say that Rivet has done it very badly because "they have never derailed in TSW", so the system is broken. But perhaps they don't understand that this route is unique and special, unlike any other we have enjoyed in TSW so far. Well, now I'm afraid that when they release a patch they're going to leave the route to be played in arcade mode so that the second group will stop complaining and make them happy. So we can all go down to Chur in TGV mode, bravo. I wish Rivet would read this and not rob us of the magnificent experience of driving this route. It is without a doubt one of TSW's best, and now I understand why they prioritised physics and performance over distant scenery. I was the first to criticise the graphics after the first stream but I didn't know how wrong I was, lucky I decided to try it for myself. I thank you for that and I can't stop recommending your purchase.