New Zealand DX class locomotive

Specifications
Specifications
Configuration:;
• Commonwealth	Co-Co
Gauge	3 ft 6 in (1,067 mm)
Length	16.9 metres (55 ft 5 in)
Width	2.74 metres (9 ft 0 in)
Height	3.70 metres (12 ft 2 in)
Axle load	DX 16.25 t (15.99 long tons; 17.91 short tons); DXR 17.5 t (17.2 long tons; 19.3 short tons)
Adhesive weight	DX 97.5 t (96.0 long tons; 107.5 short tons); DXR 105 t (103 long tons; 116 short tons)
Loco weight	DX 97.5 t (96.0 long tons; 107.5 short tons); DXR 105 t (103 long tons; 116 short tons)
Prime mover	General Electric 7FDL-12
RPM range	400–1050 rpm
Engine type	V12 Diesel engine
Aspiration	Turbocharged
Alternator	General Electric GTA-11
Traction motors	Six
Cylinders	12
Transmission	25/64 gear ratio

Type and origin
Type and origin
Power type	Diesel-electric
Builder	GE Transportation, United States
Model	GE U26C
Build date	1972–1975

New Zealand DX class locomotive
New Zealand DX class locomotive
	DXB 5143, the first locomotive to be painted in the KiwiRail livery, at Wellington Railway Station in 2009 for the launch of KiwiRail
Power type
Type and origin
Power type	Diesel-electric
Builder	GE Transportation, United States
Model	GE U26C
Build date	1972–1975
Configuration:;
Specifications
Configuration:;
• Commonwealth	Co-Co
Gauge	3 ft 6 in (1,067 mm)
Length	16.9 metres (55 ft 5 in)
Width	2.74 metres (9 ft 0 in)
Height	3.70 metres (12 ft 2 in)
Axle load	DX 16.25 t (15.99 long tons; 17.91 short tons); DXR 17.5 t (17.2 long tons; 19.3 short tons)
Adhesive weight	DX 97.5 t (96.0 long tons; 107.5 short tons); DXR 105 t (103 long tons; 116 short tons)
Loco weight	DX 97.5 t (96.0 long tons; 107.5 short tons); DXR 105 t (103 long tons; 116 short tons)
Prime mover	General Electric 7FDL-12
RPM range	400–1050 rpm
Engine type	V12 Diesel engine
Aspiration	Turbocharged
Alternator	General Electric GTA-11
Traction motors	Six
Cylinders	12
Transmission	25/64 gear ratio
Maximum speed
Performance figures
Maximum speed	105 km/h (65 mph)
Power output	DX/DXB/DXC; 2,050 kW (2,750 hp) original; 2,240 kW (3,000 hp) uprated; DXB/DXC/DXR; 2,420 kW (3,250 hp)
Tractive effort	DX 259 kN (58,000 lbf) continuous
Number in class
Career
Number in class	49
Numbers	2600–2648 (original); 5016–5520 (TMS); DXR 8007, 8022
Nicknames	"Dixies" (DX)
First run	DX November 1972; DXR October 1993; DXC 1997
Disposition	44 in service; 2 rebuilt as DXR; 1 scrapped; 1 under overhaul; 1 withdrawn

The New Zealand DX class locomotive is a type of diesel-electric locomotive that currently operates on New Zealand's national railway network. There are 49 of the locomotives and all are owned by KiwiRail. They have a Co-Co wheel arrangement.

Built by GE Transportation in Erie, Pennsylvania, United States, they were introduced to New Zealand between 1972 and 1976. The class is based on the General Electric U26C model, a narrow-gauge version of the GE U23C model. The locomotives are regarded as one of the most successful purchases in NZR's history.

The locomotives have seen several upgrades since their introduction and three sub-classes now exist: the DXB, DXC and DXR.