It's hard to figure out why you attribute this to the vehicles themselves, though. The rail line [[Red) in Cleveland has fully grade-separated right of way and makes 8 stops between Tower City and Windermere. The "BRT" line runs on the street [[e.g. has to pass through intersections and stop at signals) and makes 33[[!) stops. I defined rapid transit as dedicated right of way + frequency, but let's add "limited stop service" to the list. 33 stops in 7 miles is not rapid transit, that's local bus in a dedicated lane. It's no surprise the rail does far better.
As far as northern VA, let me speak from personal experience as a two-year commuter from Van Dorn [[next to last stop on Blue Line) in to Foggy Bottom. For the first year I rode the Blue Line exclusively because I assumed that rail had to beat bus, especially over such a long distance. But eventually I noticed all these people in ties standing at bus stops on the roads near my apartment in the morning. It turns out that while the frequency isn't as good, buses make the trip from Van Dorn to the Pentagon significantly faster than the train because they take a direct route on what are basically dedicated lanes [[HOV3) on I395. So I switched to taking the bus if I happened to be leaving at the time when a bus was definitely coming soon, and doing so saved me time [[and money) over the train.
I'm not saying the vehicle doesn't matter at all, but I think it's pretty clear that the design of the actual system has much more to do with how quickly or reliably you get someplace. If you put a train in tracks on the street and gave it 33 stops in 7 miles [[aka, a streetcar) it's not going to beat a bus running in a purpose-built exclusive viaduct with 8 stops.
More people might still ride the train just because of the train > bus social bias, comfort issues or whatever, but that's a different point from performance.
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