Prussian G 8.1

Specifications
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)

Type and origin
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

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
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
Builder
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
Gauge
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)
Maximum speed
Performance figures
Maximum speed	55 km/h (34 mph)
Indicated power	927 kW (1,243 hp)
Numbers
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).

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