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Between 1941 and 1949 the second (of just four) series of trolleybuses was put in service in Barcelona. These were called "type B", since the previous ones were type A. They look kinda different, but mechanically they were quite similar.
Interesting story, the driver in these was enclosed in a little cabin which in the hot summers became so unbearable that the from windscreen had to be modified to open and let in fresh air.
Spanish engineering at its finest.
