The Arosa line is a great line. It's the brakes. The brakes don't seem to stay on the white line. You seem to be over accelerating or slowing right. It doesn't seem to even itself out. Instead of looking at the views of the alps, you seem to be looking at the HUD to see if you're over speeding or slowing down.
The brakes are tricky to get the hang of at first particularly with the physics issues that are currently being worked on. When I was travelling down hill I found a fix of the train brake and mostly dynamic brake worked best and I was able to balance it out and enjoy the view. I had the vacuum brake at around 20% and the dynamic brake at around 80-90% on the 6% gradient.
100% control wheel brake held me at 29-31 (increasing past this took between 15-25 seconds) and using 8-18% vac brake then held the speed at 28-29 for a further few seconds before it started to reduce further which is the closest to holding speed I’ve managed this far. HTH.
When you apply some vacuum brake then you will have room to fine tune your braking with the wheel brake. The gradient is going to change anyway at some sections so you'll never hold a set speed too long downhill. If you derail downhill, consider taking off the wheel brake at those sections and use only the vacuum brake. Usually it's the tight turn onto another track that does it for me. It was said in Matt's livestream to only use the vacuum brake until a patch is released (to address the physics). That in reality will create a lot of wear. I'm still using the wheel brakes but taking a little extra care on the downhill services.
Its funny. I just used the vaccum brake around 55-60% and managed to do Arosa-Chur within the speed limits. I could even enjoy the Alps. Use only the Vaccum brake to "regulate" the speed downhill, and be 1-2 km/h under the designated line speed, since the dynamic brake is too weak atm...
