Série 9020 was a class of metre-gauge diesel locomotives built by Alsthom for the Portuguese Railways (CP). They entered service in 1975. By the early years of the 21st century the metre-gauge lines on which they operated (such as the Corgo line and the Tua line) have now almost all been closed, resulting in the withdrawal of the locomotives. After their withdrawal, some of the locomotives were sold to Madarail in Madagascar.

Class 9020
A locomotive of Série 9020, at Livração station in May 1996
Type and origin Builder Alsthom Total produced 4
Specifications Configuration: ​  • AAR B-B  • UIC B' B' Gauge 1,000 mm (3 ft 3+3⁄8 in) Wheel diameter 950 mm (37.4 in) Prime mover S.A.C.M MGO V 12 ASHR RPM range 1.500 RPM Engine type 4-stroke Diesel Displacement 54 L (54,000.0 cc) Generator Alsthom CC 830 H 10 Traction motors Alsthom TA 641 M Cylinders V12 Cylinder size 175 mm × 192 mm (6.9 in × 7.6 in) Transmission Diesel-Electric Gear ratio 79:14 MU working Within class, up to 3 Train brakes Westinghouse air brake, Vacuum brake Safety systems VACM dead mans switch
Performance figures Maximum speed 70 km/h (43.5 mph) Power output: ​  • Starting 1,050 hp (783.0 kW)  • Continuous 1,000 hp (745.7 kW) Tractive effort: ​  • Starting 11,500 kgf (25,353.2 lbf)  • Continuous 10,600 kgf (23,369.0 lbf)
Career Operators Comboios de Portugal Class Série 9020 Numbers 9001 - 9004 Locale Portugal First run 1975 Disposition seven sold to Madarail
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