Originally Posted by Aylmer
Say you have two stations:
Station A has a train every 90 seconds and only one line.
Station B also has a train every 90 seconds, but has two lines.
Station B will have more congestion than Station A because you'll have people getting in and out of the station plus people waiting on the platform for the next train.
In Station A, the whole platform clears out every 90 seconds, but in B, you have people navigating their way around the waiting passengers.
So with interlining, you need wider platforms than you would otherwise need. It's definitely not an argument against
interlining - it's just something that is necessary if ever you want to do it.
Assuming the same frequency, yes.
But the comment was made with the assumption that frequency could be improved significantly.
If that is the case, then it is possible to move more passengers through each station even with interlining. Yes, there would be more passengers on the platform than with a single line, but frequency would compensate for the accumulation of passengers on the platform.
Obviously, as you approach the line capacity, you can't continue to do that.
Also, depending on the degree of commonality of the interlined routes, many will be able to take the first train anyways reducing the platform problem.