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I discovered this the hard way. My daughter and I worked out how to get where we wanted to go by studying the map, but after we switched lines we were approached by two uniformed officials who demanded to see our tickets.

We were then required to pay a fine. I'm satisfied that the two officials were genuine but I suspect that they saw us - two tourists - as an easy target, because they followed us as soon as we got off the first train and on to the second.

The fine would have paid for several taxi fares, so other visitors to Budapest might wish to use that means of transport instead of the underground.]]> http://www.ivebeenthere.co.uk/tips/4897