The MaK G 1205 is a class of four axle B'B' diesel-hydraulic locomotives built by the Maschinenbau Kiel factory.

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MaK G 1205
Teutoburger Wald-Eisenbahn (TWE) MaK G 1205
Type and origin Power type Diesel Builder MaK Build date 1991–1997[1] Total produced 31[1]
Specifications Configuration: ​  • UIC B'B' Gauge 1,435 mm (4 ft 8+1⁄2 in) Wheel diameter 1,000 mm (39.37 in) (new)[1] Minimum curve 60 m (197 ft)[1] Wheelbase bogie centre distance 6.100 m (20 ft 0.2 in)[1] axle distance 2.400 m (94.49 in)[1] Length 12.800 m (41 ft 11.9 in)[1] Width 3.080 m (10 ft 1.26 in)*[1] 3.100 m (10 ft 2.05 in)[1] Height 4.415 m (14 ft 5.82 in)*[1] 4.220 m (13 ft 10.14 in)[1] Fuel capacity 3,000 L (660 imp gal; 790 US gal)*[1] 2,500 L (550 imp gal; 660 US gal)[1] Prime mover CAT 3512 DI-TA : 1,120 kW (1,500 hp)*[1] MTU 12V 396 TC14 : 1,180 kW (1,580 hp)[1] Transmission Voith L5r4U2[1]
Performance figures Maximum speed 60 km/h (37 mph)*[1] 80 km/h (50 mph)[1] 100km/h**
Eisenbahn und Hafen version **Banverket version

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The locomotives are of a similar design to the MaK G 1204 BB locomotives, with hydraulic transmission, B'B' wheel arrangement, and off-centre cab.

The first twelve locomotives were built for the Eisenbahn und Hafen in Duisburg, Germany, and were powered by a V 12 Caterpillar engine, the remainder were powered by a similarly powered V 12 MTU engine also used on the MaK G 1204 BB. The Voith hydraulic converter is the same as that used on the MaK G 1204 BB and MaK G 1202 BB.

Of the 19 MTU engined versions 6 were built for NISCO (National Iranian Steel Company), 10 have worked for a variety of German private railway companies, 1 for Graz-Köflacher Eisenbahn- und Bergbaugesellschaft mbH in Austria,^[1] and 2 for Banverket in Sweden.^[2]

• The Belgian Railways Class 77, of which 170 were built, is a development of the design.