Been doing a lot of writing about the FRA regulations dealing with light rail. While searching for the regulations themselves, I found this interesting blog post. It's a few years old, but informative and interesting nonetheless.
Could the issues raised in the post indeed have something to do with how expensive/troublesome it has been to get our national passenger rail network off the ground? I can't say for sure, but there are some interesting points brought up that would support that notion.
I found the portion on TOD and silent crossings to be particularly interesting (that's how you know if you're a transit nerd)
Pittsburgh Street Lights Update
2 years ago