Unfortunately no. The main difference is mass - US trains are vastly heavier than anything in the UK so by the time you make a tram crashworthy it isn't a tram any longer.
That said, I believe the FRA did allow lighter designs such as the Siemens FLIRT for commuter lines so the rules are definitely less onerous.
That said, I believe the FRA did allow lighter designs such as the Siemens FLIRT for commuter lines so the rules are definitely less onerous.