I have been reading that speed limits are often limited by factors such as passenger comfort before being limited by risk of derailment (ie the board may say 90mph but you could do 100mph without running the risk of derailing).
With this in mind I was wondering:
A) How far above the speed limit can you go before running the risk of a derailment - 5mph, 10mph, 20mph etc? I know it will likely vary in different places but whenever there is variation there is an average.
B) Can drivers be a bit generous with their interpretation of the speed limit in order to make up lost time at the expense of passenger comfort?
With this in mind I was wondering:
A) How far above the speed limit can you go before running the risk of a derailment - 5mph, 10mph, 20mph etc? I know it will likely vary in different places but whenever there is variation there is an average.
B) Can drivers be a bit generous with their interpretation of the speed limit in order to make up lost time at the expense of passenger comfort?