A doppler shift thingamajig might work in a lab, but not in the real world. I guess, such a calculation could have been one of the inputs to the system. I do

A doppler shift thingamajig might work in a lab, but not in the real world. I guess, such a calculation could have been one of the inputs to the system. I do get your point that an ML system for such a thing is an overkill. I guess there are more reliable and rugged methods to get the speed of the incoming train (sensors that need not be mounted on the train)