Belgian Railways Class 77

SNCB/NMBS 77
Diesel locomotive #7798 of the Belgian State Railways (SNCB – NMBS), 2010
Type and origin Power type Diesel Builder Vossloh Schienentechnik/Vossloh Locomotives Serial number 1000918 – 1001007 1001217 – 1001296 Build date 1999–2005 Total produced 170
Specifications Configuration: ​  • UIC B'B' Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Wheel diameter 1,000 mm (39.37 in) (new) Minimum curve 75 m (246.06 ft) Wheelbase bogie centre distance 7.770 m (25 ft 5.9 in) axle distance 2.400 m (7 ft 10.5 in) Length 15.590 m (51 ft 1+3⁄4 in) Width 3.052 m (10 ft 1⁄8 in) Height 4.220 m (13 ft 10+1⁄8 in) Loco weight 90 t (88.6 long tons; 99.2 short tons) Fuel capacity 4,200 L (920 imp gal; 1,100 US gal) Prime mover Anglo Belgian Corporation 6DZC-1000-144A Engine type V6 Alternator Auxiliary 3 phase 65–130 kW Cylinders 6 Transmission Voith Hydraulic L4r4zseU2a Loco brake pneumatic (Knorr-Bremse)
Performance figures Maximum speed 100 or 60 km/h (62 or 37 mph) Power output 1,150 kW (1,540 hp) Tractive effort 210–265 kN (47,000–60,000 lbf)
Career Operators SNCB/NMBS Class 77 Numbers 7701–7870 Disposition in service

The NMBS/SNCB Class 77 (also known as HLD 77 or HLR 77) is a class of 4 axle B'B' road switcher diesel hydraulic locomotive designed for shunting and freight work manufactured at the beginning of the 2000s by Vossloh Schienentechnik/Vossloh Locomotives at the Maschinenbau Kiel plant in Kiel, Germany for the National Railway Company of Belgium (SNCB/NMBS).

Background and design

The initial order for 90 locomotives was given to Siemens in 1997 to replace an aging diesel fleet; the railway opted for a locomotive suitable for both shunting and mainline use, rather than separate classes. Siemens sold its locomotive manufacturer division (Siemens Schienenfahrzeugtechnik) to Vossloh in 1998.

The locomotives were variants of the standard MaK G 1200 series design, and are considered a development of the MaK G 1205 type. The locomotive is an off-centre cab design with a two-speed Voith hydraulic transmission driving all axles via cardan shafts. Auxiliary electrical supply is provided by an engine mounted alternator. Unlike many other MaK locomotives which use a MTU or CAT 12-cylinder V engine the locomotive has an ABC 6-cylinder inline engine.

The first locomotive was delivered in October 1999, and worked satisfactorily; a second order for 80 locomotives was given in June 2001.

Operations

The first locomotive entered service in February 2004. All 170 units were operational by June 2005.

Due to its relatively low power the locomotives work in multiple on heavy freight trains.

Equipment variations

Sets of the class vary in the type of equipment they carry:

NMBS/SNCB number	Radio control	Cab Radio	ATB	Notes
7701–7708	Yes	Yes	No	Fitted with automatic coupler for hill shunting; not approved for Netherlands
7709–7728				Approved for limited operations in Netherlands
7729–7770	No
7771–7790			Yes	Approved for Netherlands and Germany (2004); fitted with PZB system
7791–7865		No	No	Can operate in Netherlands when in multiple with locos with ATB or radio
7866–7870		~	Yes	Fitted with ATB and PZB in 2008 for work in Germany (Iron Rhine line)

See also

• NS Class 6400 similar concept diesel electric freight locomotives built by MaK/Siemens between 1988 and 1995 for the railways of the Netherlands.

External links

• Images: SNCB série 77, www.rail.lu
• Images: Belgian freight diesel class 77, www.railfaneurope.net