Portuguese train type 3100

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The Série 3100 are a class of three-carriage electric multiple unit trains used by Portuguese Railways (CP) on the line between Cascais, Estoril and Cais do Sodre station in Lisbon, Portugal.[1] The line is electrified at 1,500 Volts direct current - unique in Portugal (where the railways are mostly electrified at 25kV 50Hz).

The units were built by Cravens of Sheffield in 1950, but extensively modernised in 1998. These refurbished trains - or remodelados in Portuguese - became Série 3150 after refurbishment.