On Dec 5, 1:52*pm, wrote:
if it's raining I might want to get the Tube to
Shepherds Bush and then WLL - you get charged twice, more than if you
took a journey of equivalent length on the Tube, even changing lines.

No you don't. Oyster PAYG fares are based on the start and end points
of your journey. If you change trains at a recognised interchange,
even if you have to go through barriers or out onto the street, it
counts as a continuation of the same journey. In other words, in your
scenario, the second leg is free.

So changing between the Tube and the WLL at SB doesn't count as
changing mode?

If I travel from, say, St Paul's to Waterloo via Holborn changing onto
a bus from Kingsway, surely I pay £2.50, £1.50 for the Tube and £1.00
for the bus. *If I do the same journey by going on as far as Tottenham
Court Road and get the Northern line it only costs me £1.50. *My point
was that you should be able to do the first journey for the same price
as the second - I don't think you can.

PAYG on the Overground (and on other NR lines where Oyster is
accepted) is treated the same as PAYG on the tube, and hence a journey
that involves both is only considered as one journey. I think this is
true for the DLR as well.

Buses are different. $deity knows why, although my guess would be
technical implementation reasons rather than an ideological dislike of
mixed-mode bus-rail journey.

--
John Band
john at johnband dot org
www.johnband.org