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Diesel locomotive #7798 of the Belgian State Railways (SNCB – NMBS), 2010
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The NMBS/SNCB Class 77 (also known as HLD 77orHLR 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).
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.[4] Siemens sold its locomotive manufacturer division (Siemens Schienenfahrzeugtechnik) to Vossloh in 1998.[5]
The locomotives were variants of the standard MaK G 1200 series design,[2] and are considered a development of the MaK G 1205 type.[1] The locomotive is an off-centre cab design with a two-speed Voith hydraulic transmission driving all axles via cardan shafts.[2] Auxiliary electrical supply is provided by an engine mounted alternator.[4] Unlike many other MaK locomotives which use a MTUorCAT 12-cylinder V engine the locomotive has an ABC 6-cylinder inline engine.[3]
The first locomotive was delivered in October 1999, and worked satisfactorily; a second order for 80 locomotives was given in June 2001.[4][6]
The first locomotive entered service in February 2004.[7] All 170 units were operational by June 2005.[8]
Due to its relatively low power the locomotives work in multiple on heavy freight trains.
Sets of the class vary in the type of equipment they carry:[4]
| 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[6] | |||
| 7729–7770 | No | |||
| 7771–7790 | Yes | Approved for Netherlands[9] and Germany (2004);[10] fitted with PZB system | ||
| 7791–7865 | No | No | Can operate in Netherlands when in multiple with locos with ATB or radio[9] | |
| 7866–7870 | ~ | Yes | Fitted with ATB and PZB in 2008 for work in Germany (Iron Rhine line)[11] |
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| Single System : 3000 V DC |
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| Dual System : 1500, 3000 V DC |
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| Dual system : 3000 V DC, 25 kV 50 Hz AC |
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| Triple System : 1500, 3000 V DC, 25 kV 50 Hz AC |
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| Quadruple System : 1500, 3000 V DC, 25 kV 50 Hz & 15 kV 16⅔Hz AC |
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| Main line locomotives |
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| Shunting and short trip locos |
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| Steam locomotives |
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| Electric locomotives |
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| Diesel locomotives |
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MaK/VSFT/Vossloh Kiel locomotives
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| 1st generation 1954–1967 |
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| 2nd generation 1965–1978 |
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| 3rd generation 1977–2016 |
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| 4th generation 2001–2016 |
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| 5th generation 2008–present |
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| 6th generation 2022–present |
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| Export builds |
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 and  locomotives |
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| Experimental locomotives and rebuilts |
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Locomotive types in italics are in production. G-type locomotives have diesel-hydraulic transmissions, DE-type locomotives have diesel-electric transmissions. | |||||||
