"Matthew Dickinson" wrote in message

First Great Western will accept Oyster Pay As You Go at all stations
between Paddington and West Drayton or Greenford from the 21st
September, according to a leaflet I picked up at Ealing Broadway
yesterday. The fares and peak periods will be the same as for the
tube.

As a matter of interest, how do you get charged on a pre-pay Oyster card
if the journey involves both NR and LE, with an out of barrier change --
eg, if you take FGW from, say, Ealing Broadway to Paddington, then
change to the Circle from Paddington to, say, Baker Street? Is it
treated as a single zone 1-3 journey, or a zone 1-3 plus a zone 1
journey? And, presumably, the same rule applies with other operators,
such as Chiltern or even London Overground?