When the Metro Bilbao system was created in 1995 the local authorities realized that the transport system integration around Bilbao was very deficient. There were four rail companies (five now with the creation of the tramway) and two bus companies, each one with different zones and fare systems, plus different ticket machines and even ticket sizes.
The Biscay Transport Consortium (CTB), created in 1975 to build the underground, was the public company that would lead the efforts to overcome the situation.
In 2014 the Creditrans tickets were replaced by plastic 'Barik' cards which work on the same principle except you can add credit to them through the regular ticket machines instead of buying a new card each time.
When a Creditrans is validated, the amount subtracted from its denomination is variable depending on the transport used. Also, when using two transports in a row (for instance Underground and bus) a 20% discount is applied on the second trip.
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