Hi Searched all over for this information, can't really believe it's so hard (read impossible) to find: Currently, with a rail ticket and *I believe* also with an Oyster, I can go from Brentwood to Liverpool St via Shenfield. There used to be a separate ticket which allowed going via Shenfield but it was scrapped and station publicity announced that all tickets from Brentwood included via Shenfield. I asked at Brentwood ticket office what would happen to this arrangement after tfl take over the route and was told that it would no longer be possible, tickets would only be valid on the Metro service, not on Greater Anglia to Shenfield. My question is this: Why can't I do this with an Oyster? Greater Anglia still accept Oyster to Shenfield, it's also valid between Shenfield and Brentwood. The only issue I can see is that there are no pink route validators at Shenfield, so there's no way to distinguish between direct from Liverpool St and via Shenfield. I still find it hard to believe that there's no information about it at Brentwood.