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

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CP Class 0100
A CP railcar of Série 9100 at Amarante station on the Tâmega line, May 1996
In service	1949-2002
Manufacturer	NOHAB
Constructed	1949
Number built	3
Capacity	1st class: 8 seats 2nd class: 28 seats standing: 20 places
Operators	Comboios de Portugal
Lines served	Tâmega line
Specifications
Car body construction	Steel
Wheel diameter	700 mm (27.6 in)
Maximum speed	70 km/h (43 mph)
Weight	26,125 kg (57,595.8 lb)
Traction system	Diesel-hydraulic
Prime mover(s)	2 × Scania-Vabis D-802 4 stroke 8-cylinder diesel
Power output	2 × 150 hp (110 kW)
Tractive effort	3,680 kgf (8,113.0 lbf)
Transmission	2 × A.B Atlas Diesel D F B-10-Lysholm-Smit
UIC classification	B' B'
Braking system(s)	Knorr compressed-air
Safety system(s)	Dead man's switch
Track gauge	1,000 mm (3 ft 3+3⁄8 in) metre gauge
Notes/references
primary reference[1]

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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 They were in revenue service until 2002, when they were withdrawn and replaced by the new CP Série 9500 railcars.

• two CP 9100 railcars in Livração in 2003
• CP 1901 at Amarante on 7 November 1993