Wheel flats are a regular problem in leaf fall season. How about putting device, such as a smaller version of a third rail pickup shoe, in front of the leading wheel of every train which is kept out of rail contact normally, but deployed under spring pressure in the event of a brake application? One at each each end for each track of a multiple unit should suffice.
Discuss!
A track brake? Some tramways use them in emergencies, but they have a habit of welding themselves to the rails