In message , Dave Arquati
writes
Oyster prepay currently only deals with singles, and you can't use an
LU single to travel from Central London to Ealing Bdy by National Rail.

Yes, this seems to be the obscure [to a tourist expecting to find an
integrated transport system] reason for this. But with travellers
expected to pass through an Oyster-operated gate to get to some of the
National Rail services on that line, and having to pass through an
Oyster-operated gate to exit Ealing Bdy station, they could be excused
for being *extremely* confused.

Why didn't someone make it a condition of national rails TOCs operating
within the Oyster area that they accept Oyster single tickets?
After all, they accept Oyster Travelcards, so what's the fundamental
difference?
--
Roland Perry