Lisbon has one of the funniest streetcar networks in Europe, and probably worldwide. Five lines still operate on the narrow gauge system (900 mm - 2 ft 11 7⁄16 in), even after construction of an extensive heavy transit subway system.
The minimum radius is particulary sharp, only 9 meters. Fourwheeled wooden cars are still in service, not only in heritage service, but in revenue runs. During the night, on line 15, the articulated Siemens cars are replaced by Brill built 4 wheelers.
Many american streetcar pratices are still visible in operation : Trolley poles (on line 28), reversible seats, K-type controllers, Brill built carbodies or local copies...