DRG Class 99.21

German narrow-gauge steam locomotive

1,000 mm (3 ft 3+3⁄8 in) +
1,000 mm (3 ft 3+3⁄8 in) =

• Engine2,000 mm (6 ft 6+3⁄4 in)Length:
• Over headstocks5,500 mm (18 ft 1⁄2 in) • Over buffers6,400 mm (21 ft 0 in)Height3,200 mm (10 ft 6 in)Axle load6.1 tonnes (6.0 long tons; 6.7 short tons)Adhesive weight18.3 tonnes (18.0 long tons; 20.2 short tons)Empty weight14.8 tonnes (14.6 long tons; 16.3 short tons)Service weight18.3 tonnes (18.0 long tons; 20.2 short tons)Fuel typeCoalFuel capacity600 kg (1,300 lb)Water cap.1.8 m³ (396 imp gal; 476 US gal)Firebox: • Grate area0.60 m² (6.5 sq ft)Boiler:
• Pitch1,850 mm (6 ft 7⁄8 in) • Tube plates2,550 mm (8 ft 4+3⁄8 in) • Small tubes41.5 mm (1+5⁄8 in), 90 offBoiler pressure14 bar (14.3 kgf/cm²; 203 psi)Heating surface: • Firebox2.66 m² (28.6 sq ft) • Tubes26.40 m² (284.2 sq ft) • Total surface29.06 m² (312.8 sq ft)CylindersTwo, outsideCylinder size310 mm × 400 mm (12+3⁄16 in × 15+3⁄4 in)Valve gearHeusinger (Walschaerts)Train brakesKnorr compressed airParking brakeCounterweight brake

Performance figures
Maximum speed	40 km/h (25 mph)
Indicated power	140 PS (103 kW; 138 hp)

Career
Numbers	99 211
Locale	Wangerooge
Delivered	1929
Retired	1960
Disposition	Preserved, on static display

Built in 1929 by German locomotive builder Henschel & Son, the Deutsche Reichsbahn Class 99.21 was a unique narrow gauge 0-6-0T steam tank locomotive built for the Wangerooge Island Railway on Wangerooge, one of the German-owned Friesian islands in the North Sea.

History

For hauling eight-wheeled passenger coaches a more powerful locomotive was needed. After the procurement of diesel locomotives in 1958 she remained for a time as a reserve engine. She carried number 99 211.

Today the locomotive is restored and is displayed as a monument on Wangerooge.

Technical Details

The inner frame of the locomotive was also used as a water tank. She was designed as a saturated steam locomotive. The boiler had two shell rings and 90 heating tubes. The drive was achieved via a Walschaerts valve gear driving the third axle. The wheels on the centre axle were made without flanges to improve curve running.

The engine could hold 0.6 tonnes of coal in side tanks either side of the boiler, and 1.8 m³ of water in the frame and in an attachment to the coal bunker. The engine was first equipped with electrical lighting in 1953.

Gallery

The preserved 99.211

References

Werning, Malte (1999). Wangerooge: Die Inselbahn und ihre Geschichte. Gülzow: Lokrundschau Verlag. ISBN 3-931647-09-9.
Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 131–133, 207. ISBN 3-87094-087-5.