NWE No. 21

NWE No. 21
DR Class 99.600

Type and origin
Builder	Krupp Essen
Build date	1939
Total produced	1

Specifications
• German	K 35.10
Gauge	1,000 mm (3 ft 3+3⁄8 in) metre gauge
Driver dia.	1,000 mm (3 ft 3+3⁄8 in)
Carrying wheel diameter	600 mm (1 ft 11+5⁄8 in)
Minimum curve	40 m (131.23 ft)
Wheelbase:
• Overall	6,060 mm (19 ft 10+1⁄2 in)
Length:
• Over beams	8,875 mm (29 ft 1+3⁄8 in)
Width	2,600 mm (8 ft 6+3⁄8 in)
Height	3,650 mm (11 ft 11+3⁄4 in)
Adhesive weight	30 t (30 long tons; 33 short tons)
Empty weight	37.84 t (37.24 long tons; 41.71 short tons)
Service weight	47.58 t (46.83 long tons; 52.45 short tons)
Fuel capacity	2 t (1.97 long tons; 2.20 short tons)
Water cap.	5 m³ (1,100 imp gal; 1,300 US gal)
Boiler:
No. of heating tubes	108
No. of smoke tubes	32
Boiler pressure	14 kp/cm² (1.37 MPa; 199 psi)
Heating surface:
• Firebox	1.56 m² (16.8 sq ft)
• Radiative	7.36 m² (79.2 sq ft)
• Evaporative	72.00 m² (775.0 sq ft)
Superheater:
• Heating area	25.2 m² (271 sq ft)
Cylinders	2
Cylinder size	420 mm (16+9⁄16 in)
Piston stroke	500 mm (19+11⁄16 in)
Valve gear	Heusinger
Parking brake	counterweight handbrake
Couplers	Equalising lever coupler

Performance figures
Maximum speed	50 km/h (31 mph)→
Indicated power	400 kW (544 PS; 536 hp)
Tractive effort:
• Starting	7.4 Mp (73 kN; 7.3 LT_f; 8.2 ST_f) / 72.5 kN (16,300 lb_f)

Career
Numbers	NWE No. 21^II DR 99 6001

The NWE No. 21^II, later DR 99 6001 is a narrow gauge steam locomotive that was built in 1939 for a track gauge of one metre and is still on duty with the Harz Narrow Gauge Railways (HSB) today.