It's unwise to carry only one payment method as it can become a single point of failure in the event of an issue.
I normally carry at least one bank card in addition to my phone and I usually have a £10 or £20 bank note with me as well.
Same here. Well I don't use the mobile for financials but I have a debit card, credit card and cash. That is on top of the Oyster pre-pay that is now replaced with a freedom pass.
These are the hardest people to deal with. Without a heavy (and expensive) police presence, often you can't do anything. Even with that, you're probably just getting some false details. Hence you've got the railway throwing the book at people who let their railcard expire by a day or two, and others not paying sometimes with the blessing of rail staff (to avoid conflict).
I agree the worst "passengers" will be the hardest to deal with. Let them stick out like a sore thumb and then a concerted effort. It might be easier for staff if they are only trying to deny access to a lower number of evaders.
The system is reliant on that most people will do the right thing, and more cynically that very few can make the behavioural change from meek middle class commuter to thug. If fare evasion on Croydon Trams is only 7%, society is still very honest (or TfL believe their own hype).
I must admit I am not sure 7% evasion is good and I am not sure it is as low as that for trams !.
I will come unstuck one day because forgetting to touch the platform card reader is easier than forgetting to touch in as you get on the bus. With the bus the two actions are connected but with the tram one has to find the reader (usually hidden in the middle of a bunch of people) and get to it. There is a risk if one just makes the tram in time that you jump on and then hopefully realise your mistake. Also the screens of the readers are unreadable so no error message is going to be picked up.
Once what I saw was the trams destination was a conflict at Church Street where the route diverges it said West Croydon on the platform BUT Wimbledon inside the tram. There were people who got on quickly and went the wrong way and people who jumped off quickly when they could have stayed on - I went out to ask the driver. Some of the people dashing on and going the right way turned out to have forgotten to touch in, they touched in at the next stop. I think because they would use the bus if a tram had not suddenly been so imminent. You do not want to touch in with pre-pay if you are not going to use the tram !.
Interesting there is still confusion about the trams and Oyster. Only today I saw a couple at East Croydon rush back out of the station and across the tram tracks to the furthest tram stop to touch out !.
Some people think it is like the trains - but no harm done except these two did dash in front of an arriving tram !. It was noticeable !.
I could argue the tram method is a bit error prone but then it is like stations with no barrier. Except you do not have to bother when leaving the tram stop. Except when joining a tram at Wmbledon where you have to use the reader on the tram platform AFTER touching in upstairs (or coming in by train). Now that must be a can of worms - having a tram stop inside a railway station.