Prussian G 7.3

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Prussian G 7.3 Mecklenburgische G 7.3 DR Class 56.0/2 PKP Tr1
Lübeck-Büchen Railway (LBE) No. 85 in 1932
Number(s)	DR 55 701, 56 001–005, 56 201–205
Quantity	85
Manufacturer	Hanomag J.A. Maffei Krauss Maschinenfabrik Esslingen
Year(s) of manufacture	1893/94 and 1917
Retired	by 1945
Wheel arrangement	2-8-0
Axle arrangement	1′D n2v
Type	G 45.17
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Length over buffers	16,318 or 17,352 mm (53 ft 6+1⁄2 in or 56 ft 11+1⁄4 in)
Service weight	56.2 or 60.5 t (55.3 or 59.5 long tons; 61.9 or 66.7 short tons)
Adhesive weight	50.5 or 52.5 t (49.7 or 51.7 long tons; 55.7 or 57.9 short tons)
Axle load	12.63 or 13.13 t (12.43 or 12.92 long tons; 13.92 or 14.47 short tons)
Top speed	45 km/h (28 mph)
Driving wheel diameter	1,250 mm (4 ft 1+1⁄4 in)
Leading wheel diameter	1,000 mm (3 ft 3+3⁄8 in)
LP cylinder bore	750 mm (29+1⁄2 in)
HP cylinder bore	530 mm (20+7⁄8 in)
Piston stroke	630 mm (24+13⁄16 in)
Boiler Overpressure	12 or 14 kgf/cm2 (1,180 or 1,370 kPa; 171 or 199 lbf/in2)
Grate area	2.31 m2 (24.9 sq ft)
Evaporative heating area	146.9 m2 (1,581 sq ft)
Tender	pr 3 T 12 / 16,5
Water capacity	12.0 or 16.5 m3 (2,600 or 3,600 imp gal; 3,200 or 4,400 US gal)
Where two figures are given, the second relates to the 1917 deliveries

The Prussian G 7.3 was a class of 2-8-0 locomotives of the Prussian state railways. The third class of the G 7 series, they were intended to power heavy goods trains on steep inclines, on which the permissible axle load was not yet that high. This affected for example, the Paderborn–Holzminden and Betzdorf–Siegen routes.

A larger boiler could be used due to the front carrying axle. Like the G 7.2, the G 7.3 was designed as a compound locomotive. A total of only fifteen of these locomotives were built between 1893 and 1895, all of them by Hanomag; this was due to and increase in the permissible axle loads meant that the cheaper G 7.1s, without a front carrying axle, could also travel on these routes. In World War I this type was remembered because there was a need for simple locomotives with a low axle load, and production was resumed. Another 70 locomotives were built by J. A. Maffei, Krauss and Maschinenfabrik Esslingen. They differed from the earlier series, among other thinks, with a higher boiler pressure of 14 kgf/cm² (1,370 kPa; 199 lbf/in²) and a feedwater heater. They were delivered directly to the German Army railways (Heeresbahnen).

After World War I several locomotives had to be surrendered to foreign railways. The Polish State Railways (PKP) operated 23 locomotives under the class designation Tr1.

The Grand Duchy of Mecklenburg Friedrich-Franz Railway (MFFE) bought five G 7.3 locomotives second-hand, and the Lübeck-Büchen Railway Company (LBE) bought four G 7.3s, also second-hand.^[1] In 1925, the Deutsche Reichsbahn included eleven locomotives in their renumbering plan. The G 7.3s from Prussia were renumbered 55 701 and 56 001 to 56 005, those from the MFFE, 56 201 to 56 205. After the nationalisation of the LBE in 1938, its two remaining locomotives were renumbered as (second) 56 001 and 56 002.^[1]

References[]

• Hütter, Ingo (2015). Die Dampflokomotiven der Baureihen 54 bis 59 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 273–275, 280. ISBN 978-3-937189-85-7.
• Kirsche, Hans-Joachim (1989). Lokomotiv-Archiv Mecklenburg/Oldenburg (in German). Berlin: transpress. ISBN 3-344-00326-7.
• Valtin, Wolfgang (1992). Deutsches Lok-Archiv: Verzeichnis aller Lokomotiven und Triebwagen Band 2 - Dampflokomotiven und Dampftriebwagen (in German). Berlin: transpress. ISBN 3-344-70740-X.
• Vandenberghen, J (1989). La guerre 1914 - 1918 et les locomotives "Armistice", 2. Description des locomotives K.P.E.V. (PDF) (in French). Brussels: SNCB. pp. 209–214.
• Wagner, Andreas (1990). Lokomotiv-Archiv Preußen 2 - Güterzuglokomotiven (in German). Berlin: transpress. ISBN 3-344-00471-9.
• Wagner, Andreas; Bäzold, Dieter; Zschech, Rainer; Lüderitz, Ralph (1990). Lokomotiven preußischer Eisenbahnen, Güterzuglocomotiven (EFA 2.3.2) (in German). Düsseldorf: Alba. pp. 99–104. ISBN 3-87094-134-0.
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 41–59 (EFA 1.2) (in German) (3rd ed.). Düsseldorf: Alba. pp. 134–136. ISBN 3-87094-082-4.
• Weisbrod, Manfred; Müller, Hans; Petznick, Wolfgang (1994). Deutsches Lok-Archiv: Dampflokomotiven 2 (Baureihen 41–59) (in German). Berlin: transpress. ISBN 3-344-70840-6.
• Weisbrod, Manfred (1991). Dampflokomotiven deutscher Eisenbahnen, Von Privatbahnen zur DRG (EFA 1.5) (in German). Düsseldorf: Alba. pp. 66–68. ISBN 3-87094-139-1.
• Weisbrod, Manfred (1991). Dampflok-Archiv 5 (Von der DRG übernommene Dampflokomotiven privater Eisenbahnen) (in German). Berlin: transpress. ISBN 3-344-70703-5.