On Mar 2, 12:27*am, Matthew Dickinson
wrote:
The Oyster pads that were retrofitted to the ticket machines on the
Euston - Watford line have at last been activated. They act similarly
to the new machines fitted on the North London Line as they accept
card topups in multiples of 10p, but do not accept Solo or Electron.
Wembley Central to Wembley Stadium is now an out-of-barrier
interchange.
Platforms 4 to 6 at Wembley Central still lack Oyster validators.

I wonder why they can't use a similar system to add Oyster
functionality to the (superficially similar) Tramlink and DLR ticket
machines? It seems a massive oversight. Or perhaps it's just because
London Overground is TfL's toy of the month...