In Copenhagen, Denmark the penalty is between 500 and 750 DKK ($82 - $123) -- while you can use the same ticket on all types of public transportation, the light rail and real rail are run by different companies and charge slightly different penalties.
A basic ticket is 13.50 (if you buy 10 in advance which can then be activated at any time, as is most common) to 23.00 DKK (if you buy a single one in a machine or via a text message); it lets you travel for an hour and change as much as you wish. If you travel every day between home and work you'll usually buy a flat-rate subscription.
(The prices get higher if you travel through multiple fare zones -- there are almost 100 different zones that cover Zealand and its 2 million inhabitants; it can be a somewhat confusing system sometimes resulting in travel from A to B not costing the same as travel from B to A; if you didn't buy enough fare zones you're also liable for that 750 DKK penalty above)
Bus travel require you to show a ticket at the entrance, so there's rarely secondary control, but the light rail system you have to buy or stamp a ticket yourself I guess has perhaps a 15% chance of being checked. I'd estimate at least 98% people have valid tickets on the lines I use.
A basic ticket is 13.50 (if you buy 10 in advance which can then be activated at any time, as is most common) to 23.00 DKK (if you buy a single one in a machine or via a text message); it lets you travel for an hour and change as much as you wish. If you travel every day between home and work you'll usually buy a flat-rate subscription.
(The prices get higher if you travel through multiple fare zones -- there are almost 100 different zones that cover Zealand and its 2 million inhabitants; it can be a somewhat confusing system sometimes resulting in travel from A to B not costing the same as travel from B to A; if you didn't buy enough fare zones you're also liable for that 750 DKK penalty above)
Bus travel require you to show a ticket at the entrance, so there's rarely secondary control, but the light rail system you have to buy or stamp a ticket yourself I guess has perhaps a 15% chance of being checked. I'd estimate at least 98% people have valid tickets on the lines I use.