DynamicSpirit
Established Member
The problem with orbital lines is that they almost inevitably mean 2 changes for any journey: radial-orbital-radial. Unless the frequencies are high enough that wait times are negligible then it becomes a serious disadvantage, and changes alone are bad enough. I used to live in Harrow and I did used to occasionally daydream about where a sensible orbital line would go - follow the 140/superloop to Heathrow and maybe to Feltham? Or to Ealing-Brentford-Richmond? Either would have some merit, but would either be enough to justify the investment? In the event anything were ever built I would assume it would be something like the DLR, segregated, automated shortish trains
I think the key to avoiding that problem is to ensure that the orbital lines do directly serve major destinations, which means that they would allow most of the main flows within their areas without requiring two changes. The DLR is pretty good at that: The Woolwich-Stratford line for example is basically an orbital line and it serves Woolwich, London City Airport and Stratford, which are places that a large number of people who might use the line are actually trying to get to. Ditto the Lewisham-Stratford line, which serves all of Lewisham, Greenwich town centre, Canary Wharf and Stratford. Serving such big destinations is doubly beneficial because it makes it easy to attract enough passengers to run trains at high-ish frequencies, which then means it becomes practical for people to do two changes (as I often used to do with the DLR, for example using it to go Abbey Wood-Woolwich-Stratford-Highbury and Islington).