RhB Gmf 4/4 II

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RhB Gmf 4/4
Gmf 4/4 II 23403 Surovas station
Gmf 4/4 II 23403 Surovas station
Numbering: 234 01 to 234 04 (renumbered from 287 01 to 287 04 in 2015)
Number: 4th
Manufacturer: Schalke ironworks
Year of construction (s): 2013
Axis formula : Bo'Bo'-de
Gauge : 1000 mm ( meter gauge )
Length over buffers: 16'690mm
Height: 3692mm
Width: 2650mm
Trunnion Distance: 9800mm
Smallest bef. Radius: 45 m
Service mass: 64 t
Wheel set mass : 16 t
Top speed: 100 km / h
Installed capacity: 1800 kW
Starting tractive effort: 230 kN
Continuous tensile force: 160 kN
Driving wheel diameter: 1070 mm (new)
Motor type: 12V 4000 R43L
Motor type: 12-cylinder diesel
Number of traction motors: 4th
Drive: diesel-electric
Brake: Magnetic rail brake and block brake
Gradient: 70 ‰

The diesel-electric locomotives Gmf 4/4 II 28701 to 28704 of the Rhaetian Railway (RhB) were ordered in 2009 and put into operation in 2014. In order to be able to be used in the entire RhB network including the Bernina Railway , the prerequisites were the ability to run in curves from 45 m radius and inclines up to 70 ‰ as well as compliance with a maximum axle load of 16 t. The locomotives were designed and finally assembled by Schalke Eisenhütte , which had already delivered two construction tractors RhB Te 2/2 No. 74 and 75 to the RhB in 1969 . In 2015 the locomotives were renumbered. They now have the following number: Gmf 4/4 234 01 to 234 04.

As with the Bernina railcars ABe 4/4 I , ABe 4/4 II and ABe 4/4 III , the index "II", which distinguishes the locomotives from the Gmf 4/4 242 and 243, is not written.

technology

The locomotive body was welded at FTD Fahrzeugtechnik Bahnen Dessau using lightweight steel construction with glued-on GRP fronts and side walls made of aluminum honeycomb panels. The drive equipment consists of a 12V 4000 R43L diesel engine from MTU Friedrichshafen and electrical power transmission . The locomotives can be controlled in many ways and are equipped with radio remote control. The maximum speed is 100 km / h, but the locomotives can also be used at low continuous speeds with snow plows or track construction trains.

Bogies

Schalker Eisenhütte Maschinenfabrik GmbH commissioned the Swiss engineering office PROSE in Winterthur to develop the bogies . Due to the small number of only four locomotives, no special traction motors were developed; drives from the Asiarunner from Siemens Rail Systems are used . The motors are suspended by means of a pawl bearing drive .

The primary suspension takes place via lemniscate links , which means that the robust construction takes into account the harsh operating conditions; there is no radial adjustability.

Particularly high secondary springs with special rubber tilting elements take into account the demanding operating conditions with very small curve radii . This results in a low turning resistance even in tight bends (smallest passable bend: 42 m). For stable driving behavior at high speeds on the straight, with the low turning resistance, roll dampers are necessary. There are 4 pairs of secondary springs per bogie, one pair consisting of an inner and an outer spring. The pulling force is transmitted to the locomotive body without a pivot via a pull / push rod . The double offset is special here. This is necessary in order to keep a sufficient distance to other components of the bogie despite the large deflections.

The choice of material can be seen as a special feature: In order to take into account the desired winter service, a steel with high ductility at low temperatures was selected.

commitment

The Gmf 4/4 II are used in front of heavy construction trains and in winter with snow clearing trains in the entire RhB network. They also serve as a catenary-independent reserve and for towing wrecked trains. Since they are not covered with flat trains, they are not painted red, but have the yellow paint of the RhB railway service vehicles.

literature

Powerful company vehicles for the RhB , bahnONLINE.ch, May 7, 2010