In London, it's common for employers to offer season ticket loans (a zone 6 travelcard from bearish jungles of darkest Surrey is about £2.5k, season tickets to the great heathen beyonds and lands of savagery, far more, I know people who were paying £8k/year).
My wife use to have one, which I shared as I'd go to the office twice a week, and she would do the same, but on different days. I never figured out if that was legal, but no one ever asked, so ner.
I doubt I'll go back to the office other than for meetings, and my wife, who knows, I think they want her back for two days, so it won't be cost-effective unless they do figure out a part-time system. Travelcards in London are useful, since they also operate as railcards giving you a third-off other tickets in the area, which we made a lot of use of (though you can, I think, still by a SE network card to do the same).