Comment by hdgvhicv

First was staff travel, then annual and monthly travel adds, then Prepay (later PAYG) on the tube, then bus, then overground, then later suburban trains.

If you had a z1-3 travelcard you could travel to zone 6 with Prepay as long as you had a positive credit and would have the allroaite fare deducted. For travel on train you had to buy an “extension ticket” though. That I think might have extended even past payg availability on trains for a while.

It’s amazing in hindsight how quickly things changed, but I remember the various messes were quite notable for the first 10 years of oysters existence.