The Série 9100 were a class of metre gauge diesel railcars built for use by the Portuguese Railways (CP) on the Tâmega line.

Three 9100 series railcars were built in 1949 by Swedish manufacturer NOHAB of Trollhättan. They were essentially a narrow gauge version of CP's larger Iberian broad gauge Série 0100 diesel railcars. They were in revenue service until 2002, when they were withdrawn and replaced by the new CP Série 9500 railcars.

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  two CP 9100 railcars in Livração in 2003
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  CP 1901 at Amarante on 7 November 1993
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• Narrow gauge railways in Portugal

• Website with extra technical data