It doesn't work as a concept when the train headways are short. There needs to be gaps in the line utilization to for express trains to fit in. Since skytrain depends on frequency for capacity instead of train length the idea is a non starter.
On the upside the trains move fast and accelerate like a scalded cock, so the benefit may not be all that large anyways.
Side note, I rode the RER today in Paris for the first time today. Not so fast I have to say.
__________________
"It's ok, I'm an engineer!" -Famous last words
|