Trolleybuses in Coimbra
The Coimbra trolleybus system () forms part of the public transport network in the city of Coimbra, Portugal. Opened in 1947, it supplemented, and then eventually replaced, the Coimbra tramway network. History. Trolleybus traffic was inaugurated in Coimbra on 16 August 1947 with two Saurer 3TP trolleybuses. Initially, the trolleybus system only partially replaced Coimbra's tramway network, but after several decades of concurrent operations the latter was closed, in January 1980. Until 1959, the Coimbra trolleybus system was the only one in Portugal. Since the closure of the Porto system in 1997, that has again been the  case. Lines. The system currently has two lines. Fleet. Past fleet. The initial two member Saurer fleet was augmented in 1949, with the acquisition of six new buses from Sunbeam Commercial Vehicles. The vehicles supplied were based on Sunbeam's MF2B model, with two axles and a wheelbase of . They were fitted with single deck bodywork by Park Royal Vehicles, with 40 seats and room for 35 standing passengers. In order to enable them to be operated by just the driver, they included an overhang of beyond the front axle, allowing the entrance door to be mounted just behind the  windscreen, so that payment could be made to the driver when entering the vehicle. To cope with the steep gradients of the Coimbra system, they were fitted with 600-volt motors, and each trolleybus carried two compressors, normally designed to work together, but each capable of maintaining the air supply for braking and door operation if one should fail. Three more Sunbeam Park Royals joined the fleet in 1956. Subsequent procurements included 10 BUT RETB/1s (four in 1958 and six in 1961), and six further Sunbeams in 1965. Current fleet. Today, the Coimbra trolleybus fleet is as follows: Trolleybuses in