Prussian G 8.1

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G 8.1 (Prussia, Mecklenburg, Alsace-Lorraine) DRG Class 55.25–56, 55.58 DB Class 055 PKP Tp4 SNCB Type 81 SJ Class G
Type and origin Builder Berliner Maschinenbau Borsig Grafenstaden Maschinenfabrik Christian Hagans Hanomag Henschel & Sohn Hohenzollern Humboldt Arnold Jung Lokomotivfabrik Linke-Hofmann Orenstein & Koppel Schichau-Werke AG Vulcan Stettin Build date 1913–1921 Total produced 5,155
Specifications Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Driver dia. 1,350 mm (53.15 in) Length: ​  • Over beams 18,290 mm (60 ft 1⁄8 in) Axle load 17.6 t (17.3 long tons; 19.4 short tons) Adhesive weight 69.9 t (68.8 long tons; 77.1 short tons) Service weight 69.9 t (68.8 long tons; 77.1 short tons) Water cap. 16.5 m3 (580 cu ft)/20.0 m3 (710 cu ft)/21.5 m3 (760 cu ft) Boiler pressure 14 bar (1,400 kPa; 200 psi) Heating surface: ​  • Firebox 2.58 m2 (27.8 sq ft)  • Evaporative 143.28 m2 (1,542.3 sq ft) Cylinders 2 Cylinder size 600 mm (23.62 in) Piston stroke 660 mm (25.98 in)
Performance figures Maximum speed 55 km/h (34 mph) Indicated power 927 kW (1,243 hp)
Career Numbers DRG 55 2501–3366, 3368–5665, 5801–5810, 5851–5852 DR 55 5898, 7251–7260, 8170 Retired 1973

The Prussian G 8.1 was steam locomotive operated by the Prussian state railways. It was a heavier, stronger development of the G 8 and was initially referred to as a 'strengthened standard class' (Verstärkte Normalbauart).