Linha do Vouga
Linha do Vouga (the Vouga line) is the last surviving metre gauge railway line in Portugal still operated by Comboios de Portugal. The other remaining metre gauge lines (the Corgo, Tâmega and Tua lines) all closed in 2009. The line is, however, also under the threat of closure.
Since 2002, services on the line have largely been operated by CP's Série 9630 diesel multiple units, which replaced the previous ex-Yugoslav Série 9700 diesel multiple units and the Dutch-built Série 9300 railcars.
After the line was opened by Manuel II of Portugal in 1908, the Companhia do Vale do Vouga operated it from 1907 to 1946. The first section, between Espinho and Oliveira de Azeméis, opened to traffic on 21 December 1908; the next section to be completed was between Ul and Albergaria-a-Velha. The line between this location and Macinhata Vouga, and the Aveiro extension, opened on 8 September 1911. The remainder of the line opened in 1913.
On 30 December 1946, it was nationalised and taken over by the CP.
In the 2016 timetable, the section of line between Sernada do Vouga and Oliveira de Azeméis is served by rail replacement taxi running twice daily.
-  - Timetable
- The Portuguese Government's strategic transport plan 2011-2015, including the proposed closure of the Vouga line