DSB Class MY

The class MY is a class of diesel-electric locomotives built in the years 1954–65 by NOHAB. A total of 59 units, numbered 1101–1159, were delivered to the Danish State Railways. Powered by GM-EMD engines, the locomotives represented a significant change in rolling stock policy — motive power had largely been sourced from within Denmark for several decades.[4]

DSB class MY
VL MY 105 (former DSB MY 1145) in Holbæk.
Type and origin
Power typeDiesel-electric
BuilderNydqvist & Holm AB
Build date1954–58, 1964–65
Total produced59
Specifications
Configuration:
​
 • UIC(A1A)'(A1A)'
Gauge1,435 mm (4 ft 8 1⁄2 in)
Wheel diameter1,016 mm (40 in)
Minimum curve90 m (300 ft)[1]
Length18.90 m (62 ft 1⁄8 in)
Width3.00 m (9 ft 10 1⁄8 in)[1]
Height4.295 m (14 ft 1 1⁄8 in)[1]
Axle load18 t (18 long tons; 20 short tons)
Loco weight101.60 t (100.00 long tons; 111.99 short tons)
Fuel capacity3,400 L (750 imp gal; 900 US gal)[1]
Lubricant cap.760 L (170 imp gal; 200 US gal)[1]
Sandbox cap.300 L (66 imp gal; 79 US gal)[1]
Prime moverEMD 567B
EMD 567C
EMD 567 D1
(EMD 645E)
RPM range275–800 rpm (567B)
275–835 rpm (567C, 567D1)
315–905 rpm (645E, mod. 567)[1]
Engine typeV16 two-stroke diesel
AspirationRoots blower
Cylinders16
Cylinder size8.5 in × 10 in (216 mm × 254 mm)[2]
TransmissionElectric
Safety systemsATC (from 1995)
Performance figures
Maximum speed133 km/h (83 mph)
Power output1,700 hp (1,300 kW);
1,950 hp (1,450 kW)
Tractive effort235 kN (53,000 lbf)[3]
Career
LocaleDenmark
Dispositionmajority scrapped, several preserved

History

In the early 50s the DSB was starting to look for a new type of motive power that could replace steam locomotives in Denmark.

MY 1101 was built by NOHAB alone, but all subsequent units had bodies, underbodies and bogies[1] built at Danish manufacturer Frichs in order to limit foreign currency spending.[5] For the same reason, and because of pressure from Danish industry, the electrical systems of MY 1105 and later were sub-supplied by Danish companies Thrige and Titan.[6][7]

The DSB ordered the first four units which arrived at Helsingør in 1954. The locomotives quickly became very popular among both passengers and crew.

44 of them were built between 1954 and 1958 and a further batch of 15 engines was delivered in 1964 and 1965.[8]

To replace steam on branch lines, a similar but lighter locomotive, the class MX, was developed, incorporating a 12-cylinder 567 engine.[9]

In their early years the locomotives hauled express trains (later known as InterCity) and heavy freight services, but in their later years they were transferred to smaller regional and light freight services.

In the 1980s and 90s the DSB began to have less and less need for them, and the last ordinary MY-hauled train ran in 2001. One unit however, 1135, is now a special service locomotive which runs special trains, so DSB still has MY locos in service. The others have either been scrapped or sold to diverse private operators in Norway, Germany and Sweden, who now use them on light freight duties. They are called TMY in Sweden (as diesel locomotives have names beginning with T in Sweden).

Many locomotives similar to the MY survive in other countries. They include:

Technical details

The first four units, 1101–1104, were delivered with 1,700-hp EMD 567B engines along with a spare engine. Having a spare engine was later deemed unnecessary and the fifth 567B engine was thus built into MY 1105.[7] 1106–1144 were delivered with 1,950-hp EMD 567C engines. MY 1145–1159 were delivered with 1,950-hp EMD 567D1 engines.[10] However, their powerplants were frequently swapped around among the locomotives during maintenance.[11][12]

MY 1149 received a spare 645E engine (as used in class MZ, though with the turbocharger removed) after sustaining severe frost damage in the harsh winter of 1978–79.[1]

DSB Class MV

Starting in 1968 weaker MYs with 567B engines (1101, 1102, 1104, 1109, 1134) were reclassified as class MV keeping the same numbers.[13] In 1973, MV 1104 became a MY again while MY 1144 became a MV when their powerplants were swapped. Further two MV locomotives (1101, 1134) were subsequently reclassified as class MY in 1981 and 1984 and the remainder three were taken out of service between 1985 and 1987.[14]

Livery

The locomotives were delivered in DSB's then-standard maroon colour, with horizontal white stripes along the mid and bottom of the sides and a yellow winged wheel at each front. Starting in 1965, the DIN 1451 typeface was slowly introduced for the lettering, and a few locomotives were given an "economy" maroon livery without stripes during the 1970s.[15]

A new design with black sides and red cabs was introduced by DSB in 1972. The first class MY unit to receive the new livery was MY 1147 in 1972, with the remaining locomotives repainted between 1975 and 1985.[16][15]

Preservation

Several members of the MY class have so far been preserved. By the Danish Railway Museum no. 1101 has been repainted into the original maroon livery without numbers on the front, she will only be used on special occasions to reduce wear and tear 1112 in the design livery with red cabs and black body, with one side removed to show the inside of the locomotive 1135 has been repainted into the maroon livery in 2017, from the design livery 1159 in the design livery, with separate taillamps

See also

References

Notes
  1. Andersen 1998, pp. 64–69.
  2. Christensen & Poulsen 1999, pp. 110–114.
  3. Løvborg & Mogensen 2000, p. 10.
  4. Christensen & Poulsen 1999, p. 3.
  5. Christensen & Poulsen 1999, p. 19.
  6. Andersen 1998, p. 14.
  7. Christensen & Poulsen 1999, p. 27.
  8. "DSB Litra MY, DSB MY lokomotiv - historie, data, tegning, billeder osv". www.jernbanen.dk. Retrieved 2017-11-15.
  9. Christensen & Poulsen 1999, pp. 34–35.
  10. Christensen & Poulsen 1999, p. 46.
  11. Andersen 1998, p. 48.
  12. Christensen & Poulsen 1999, p. 55.
  13. "DSB Litra MV, DSB MV lokomotiv - historie, data, tegning, billeder osv". www.jernbanen.dk. Retrieved 2017-11-15.
  14. "DSB Litra MV, DSB MV lokomotiv - historie, data, tegning, billeder osv". www.jernbanen.dk. Retrieved 2017-11-15.
  15. Andersen 1998, pp. 61–62.
  16. Andersen 1998, pp. 50–51.

Bibliography
  • Andersen, Torben (1998). DSB litra MY, type 567. Lokomotivets Forlag. ISBN 87-90779-00-2.
  • Christensen, Peter; Poulsen, John (1999). Motor Materiel 5: Med motor fra GM (in Danish). Bane Bøger. ISBN 87-88632-79-2.
  • Løvborg, Eilert; Mogensen, Peter, eds. (2000). DSB materiel i drift (in Danish) (2nd ed.). DSB drift. ISBN 87-7025-011-1.
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