please empty your brain below

The reason the OSI is long *to* Fenchurch Street is to allow people to loiter outside the gateline at Fenchurch Street waiting for their train. Maybe it takes a while before the platform is advertised. The same behaviour is unlikely at Tower Gateway.
What are the most used that aren't just transfers within one station?

dg writes: The most used OSI between two stations with different names is Canary Wharf-Heron Quays, followed by Waterloo-Waterloo East and Tower Hill-Tower Gateway.
Interestring to see that the top 5 OSIs differ slightly from the top 5 busiest mainline stations.
Is there a reason why London Bridge is much busier and Euston is less busy in the OSI sense?
Another fascinating dig into arcana.
Kent/Clock House was heavily suggested by Traveline as a way to get from somewhere to somewhere, but I didn't bite.
Why on earth would anyone walk from Marylebone to Paddington tube? Surely you'd get the Bakerloo or walk to Edgware Road (D/HC/C) instead? Indeed you pretty much have to pass ER on the walk from MYB to PAD. A very pointless OSI. (And too many TLAs, there ...)
TommyL4 - Compared with London Bridge, Oyster can be used on very few trains out of Euston.
The rule about not using a bus in between is intriguing. It ought to be possible to have two different Oyster cards so the system doesn't know you are the same person.
Really impressed with the Vauxhall figure for a non terminus NR station with only one Underground line!

As there's a cross platform interchange for the Central Line I imagine the numbers at Stratford would be massive too if measured.

Camden Town to Camden Road is one I use regularly. With the capacity issues and entrance closures at Camden Town I imagine the numbers using this OSI are a lot lower than they could be.
The OSI numbers for Canary Wharf are a little skewed because of the short time period this study covers. Occasionally TFL institute a one way system at Canary Wharf Jubilee Line station which forces passengers to enter via the West entrance and leave the station to the east. If this had happened during the period concerned the OSI numbers would be very different.
I think 1,099,999 of those Waterloo-Waterloo transfers were by me!
Thank you for yet another informative post!
Would I be right in thinking that the likes of One Day Travel Cards do not show up as OSI's?

dg writes: Yes.
I guess a LOT of SWR main suburban and Windsor Line commuters catch the Victoria Line... that doesn't entirely surprise me to be honest.
Of course they would, if you're trying to reach the West End/Euston/King's Cross it's much faster than queueing into Waterloo and then down to the Bakerloo/Northern lines...

Also, when heading the other way, it's much easier to turn up at Vauxhall and go straight to your platform for your train, then to turn up at Waterloo and play platform roulette!

Catching a NR train at Vauxhall would lessen the chance of getting a seat though
Next time I am at Hackney Central I will walk to Hackney Downs and change via the OSI just to skew your figures !! Wonder how many use the Forest Gate Woodgrange Road OSI.
...what a load of kerfuffle
Paddington LU gates used to cover the NR suburban platforms so the interchange catered for was NR-NR. When the low-level Crossrail platforms finally come into use LU gates will again give access to NR services so the interchange will come into its own again.
I'm slightly surprised no-one used the Hackney street level interchange. Changing within the station in some directions involves walking the entire length of the platform, so going via the street can seem quicker even if it isn't (and you can buy a Mars bar on the way!).
In the paragraph about number 5 the Overground and the Victoria line are the wrong way around. As currently written, it implies that the line to Chingford passes through Blackhorse Road.

dg writes: Updated, thanks.
I wouldn't have considered going via the street in Hackney after the new footway had been opened, because I would have feared that the OSI might have been taken away. (Of course, now I know different, but presumably it could still be taken away at any moment in the future without anyone considering it necessary to notify me).
That Euston to King's Cross one is bugging me as to what journeys would actually use such an interchange. There are no more stopping trains departing from King's Cross, they all go to Moorgate or St Pancras now. Other than a few peak trains that call at New Southgate and/or New Barnet, and the last train of the night which is all stops, the only place you can go from King's Cross with an Oyster card is Finsbury Park.
Gregg: but you could change again at FP for all stations trains towards Welwyn or Hertford North - though, of course, you could have gone to FP from Euston direct via the Vic.
<snip>

dg writes: Try this one again tomorrow, Nick...

Makes me wonder how many of these passengers used these OSIs by accident.

Perhaps someone from out in Metroland took the train into town, strolled from Marylebone to their favourite coffee shop on Praed Street, and then descended into the nearest Tube station to continue their business, all in under 40 minutes. And maybe then they did the same routine 8 more times over the four weeks.










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