Monorail
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Monorail was another short-lived adventure but it resulted in some pretty toys. The monorail track in itself is beautiful. The rails are more thin than regular BRIO track and therefor more refined to hold and look at. The monorail trains look futuristic with their big windows and the paneling going down over the sides of the track. This does not let them roll on the floor anymore though. They can only ride on a track. Monorail and regular track is compatible meaning trains can run on both.
Not strictly monorail, and thus not included here, but belonging to the same theme, are the Airplane and Train Passengers.