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Can't see this happening whilst rail privatisation exists
it's being looked at pretty seriously; at a guess, i'd say it could be up and running within 18 months or so, which is pretty quick for the rail industry.
on another point, rail privatisation barely exists at present with all revenue risk assumed by DfT.
I don't see that as changing in the immediate future, so DfT could easily mandate flexible season tickets, and train operators would have no reason not to implement, as they don't get the revenue anyway.
2-3 days in the office need some new kind of deal/offer from the rail companies.
Some kind of flexible 2/5 or 3/5 season ticket otherwise people will reel from the cost of buying individual day tickets (compared to the quickly forgotten reeling from the cost of the monthly or annual season ticket). Obviously it may be very tricky for the rail companies to actually implement such a thing.
A colleague used to buy one weekly season ticket every fortnight and do a two week pattern of Wed-Fri, Mon-Tue but it was a ball ache for everyone else to arrange regular meetings and quickly led to a "fuck it, everyone just WFH whenever they want" culture.