This reminds me of something I'd heard about public transport operated by local governments, not sure how true it is but the theory makes sense. But basically the local public transport company ran by the local government, spends more on the infrastructure and enforcement of people paying fares than they get back in the fares themselves and that operating the services free of charge would actually reduce the cost of running the service.

Which when you start to think about how you need officers to spot check people on public transport, roll out the machines for tickets/smart cards, server infrastructure to run the machines, technicians to service the machines, IT staff to run servers etc etc it does somewhat make sense