Travellers can see how ticket system has developed. Especially during last 20 years there have been some changes that show us how innovations within IT take over.
Let us look back in time for a period of 13 years. The commuters travelling with Swedish trains from Skånetrafiken used their train cards instead of paper tickets. That is of course very good if we think about the environment. Those cards were rechargable so travellers could use them again and again.
It was a very practical solution for all commuters but that system is not in use any more. It is decided that Skånetrafiken's smartphone app should be used instead. This one solution is also a good one. There have been some problems in the beginning phase because not everyone was able to manage the app correctly. Also the system could crash and create problems for people when paying/buying the tickets.
Nowadays it seems like the online ticket app is stable. Using the smartphone also with bad coverage or without coverage does not create problems.
Buying and recharging train ticket can be done from everywhere if your phone and bank card work. You save time and you have everything on one place. You can borrow it to someone else without being in physical contact with that person.
Some people say that your ticket is lost if you buy it without logging in to the app and if something happens so your phone does not work anymore. According to the customer support for Skånetrafiken the bought ticket can be sent to another phone if the phone number is same as it was on the phone where you bought the ticket.
So, smartphones and train tickets seem to be a good and stable combination.
Also, if something unpredictable happens and you must stop using your ticket, there is no problem to get money back if you contact Skånetrafiken and just tell your phone number. They can inactivate the ticket immediately and you get your money back. This is proven and true in connection to the Corona development in Europe when Denmark closed their borders and many commuters between Sweden and Denmark had to stop travelling to the work.