VVER-1200

No I don't think the driver would start calculating their speeds no. If the speed limit is 125 the driver will go 125, the teloc(speedometer) is registrating 125 on a paper so you can't even prove he was going faster than that ergo no penalty should be applied for going the teloc's 125

But the problem is when you don't want to use the HUD and enjoy the proper simulation, you would get penalties for going the teloc's speed (which is around 125 here) --Let's say you have a 125 km/h speed limit and you are going with 125 as the teloc shows but because of the error you would get penalty

Feature to close the brake hose's valve so you can release the brakes and reverse back to the cars?

Then the teloc's indicated speed should be used to get penalties as this feature would require the HUD to be on at all times. If this is a simulator then you should be able to have HUDs off.

Counter NO2S has the text NO1S

Same train departed 3 times at the same time.

It would be good when you can drive through 2 or more countries' lines with different signal systems, etc.