| SNCB/NMBS 77 | |
| Powertype: | Diesel |
| Builder: | Vossloh Schienentechnik/Vossloh Locomotives |
| Serialnumber: | 1000918 – 1001007[1] 1001217 – 1001296 |
| Builddate: | 1999–2005 |
| Totalproduction: | 170 |
| Uicclass: | B'B' |
| Wheeldiameter: | 1000mm (new) |
| Minimumcurve: | 752NaN2 |
| Wheelbase: | bogie centre distance 7.77m (25.49feet) axle distance 2.4m (07.9feet) |
| Length: | 15.59frac=8NaNfrac=8 |
| Width: | 3.052frac=8NaNfrac=8 |
| Height: | 4.22frac=8NaNfrac=8 |
| Locoweight: | 90abbr=on1abbr=on |
| Fuelcap: | 4200L |
| Primemover: | Anglo Belgian Corporation 6DZC-1000-144A |
| Alternator: | Auxiliary 3 phase 65–130 kW |
| Transmission: | Voith Hydraulic L4r4zseU2a[2] |
| Maxspeed: | 100km/h60km/h |
| Locobrakes: | pneumatic (Knorr-Bremse)[3] |
| Operator: | SNCB/NMBS |
| Operatorclass: | 77 |
| Fleetnumbers: | 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).
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 MTU or CAT 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 | |||
| 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 | |
| 7866–7870 | ~ | Yes | Fitted with ATB and PZB in 2008 for work in Germany (Iron Rhine line)[11] |