^ The standards are all charted in the third link I provided. This is the Law as it now stands, and answers the question one poster made (I scanned to find it, I'm rushed right now and can't) as to what speed determines whether grade crossings are allowed or not, and how HFR won't require separated grade crossings. That's in the Acts and guidelines, and by reverse logic, limits the speed *per section* that HFR will operate at. Some sections can be totally grade separated, and those, track geometry permitting, will have a higher speed limit.
The procedure to utilize the Relocation and Crossing sections has been used many times, and lays out the costing as to three levels of government, and funding if applied for to the CTA.
What the Feds have to address, and almost immediately as it pertains to GO and others, is TC regs for couplers, etc. But that's a different argument than crossings.