On 20/07/2011 12:32, Roland Perry wrote:

Many people would kill for 4tph. My own view (coloured in some part by
being a past user of the outer fringes of the Met line) is that
something magic happens between 3tph and 4tph - despite it only reducing
the interval by 5 minutes. Such that 4tph is a frequent enough service
it's turn-up-and-go for most users.

Only if the 4 trains per hour are evenly spaced...

The core Shipley to Leeds service has 4 trains per hour. But the trains
have departure trains of xx:09, xx:14, xx:39, xx:44. This isn't really
turn-up-and-go.
--
Jeremy Double {real address, include nospam}
Rail and transport photos at
http://www.flickr.com/photos/jmdoubl...7603834894248/