Série 2550 were the second batch of 25 kV electric locomotives built for Portuguese Railways (CP). They entered service in 1964 and were used on the main line between

Lisbon Lisbon (; pt, Lisboa ) is the capital and largest city of Portugal, with an estimated population of 544,851 within its administrative limits in an area of 100.05 km2. Grande Lisboa, Lisbon's urban area extends beyond the city's administr ...

and Oporto. 20 locomotives were built; as of 2012 none remain in service.CP official website
/ref> Unlike the earlier Série 2500, the Série 2550 were built with unpainted

stainless steel Stainless steel is an alloy of iron that is resistant to rusting and corrosion. It contains at least 11% chromium and may contain elements such as carbon, other nonmetals and metals to obtain other desired properties. Stainless steel's corros ...

bodywork. They were constructed by Sorefame, with components from the French company Alsthom. The Série 4700 were built in 2007-2009 as a replacement for the Série 2550.

References

{{Rolling stock of Portugal Electric locomotives of Portugal Railway locomotives introduced in 1963 Bo′Bo′ locomotives Alstom locomotives 5 ft 6 in gauge locomotives