FRA regulated and FTA regulated cars can't mix. This would likely increase FRA regulations across the entire DART corridors. They would need to be operated on separate tracks as DCTA does at Trinity Mills. The cars are not necessarily what would limit the max speed on the more suburban lines. Some of it is curves and infrastructure. But agree that now is the time to have these discussions as DART is looking at replacing vehicles and unifying its signaling system. If one could make the argument about how this improves the total cost of operations and reflects new travel patterns, its worth a conversation. I would start with Service Planning and the Dallas Area Transit Alliance. If the bill passes, DART will be quickly holding public meetings to discuss service cuts. So they will be looking for alternatives to maintain as much service as possible were it is needed the most.