LoL: "While electrification using catenary system is not under consideration for this study, the feasibility study considered the operational impact of ZEMU technology using a Stadler KISS EMU in runtime simulations because the H2-powered FLIRT MU to be used by SBCTA are limited to 79 mph."

Literally the easiest enforcement in the world would be catching people who do this. Just take away their licenses and impound their cars due to the enormous risk to the public they create (train derailment!), these drivers cannot responsibly handle driving.