So who sets the fare at Watford Junction?
London Midland. The equivalent at Maidenhead etc would be that
FGW▸ retained the fare setting role.
Through fares starting outside the zonal area, to stations within Zone 1 are set by the
TOCs▸ adding to their London Terminals fare. Suitable fares for a journey such as 'Reading to Farringdon' therefore already exist, and would be shown as Reading to U1 on a ticket.
All the central Crossrail stations, and
AFAICT▸ all those anywhere within the zones, will have common gatelines with the relevant LU station, so would have to charge the same fare as the normal 'underground' - eg there is no way to differentiate a Crossrail journey from Ealing Broadway to Liverpool St from the same journey on the Central Line.
The situation regarding stations 'beyond and between' London Terminals, ie at Farringdon, is already a bit of a nightmare under Thameslink, where different rules apply from stations on the
MML» north of St Pancras who have a valid destination of London Thameslink -
AIUI▸ this is good as far as Elephant and Castle.
Crossrail can hardly make it any worse.
Paul