SBB-CFF-FFS Re 620

SBB-CFF-FFS Re 620
Re 620 and Re 4/4IIleading a freight train on the northern Bözberg incline
Type and origin Power type Electric Builder SLMWinterthur BBCBaden SAASGeneva Build date 1972, 1975–1980 Total produced 89
Specifications Configuration: ​ •UIC Bo'Bo'Bo' Gauge 1,435 mm(4 ft8+1⁄2in)standard gauge Length 19,310 mm (63 ft4+1⁄4in) Width 2,950 mm (9 ft8+1⁄8in) Height 3,932 mm (12 ft10+3⁄4in) Loco weight 120 t (118.1 long tons; 132.3 short tons) Electric system/s 15 kV  16.7 Hz ACCatenary Current pickup(s) Pantograph
Performance figures Maximum speed 140 km/h (87 mph) Power output 10,700hp(8,000kW) Tractive effort: ​ • Starting 395 kN (89,000 lbf) • 1 hour 270 kN (61,000 lbf) • Continuous 235 kN (53,000 lbf)
Career Numbers 11601 – 11689

TheRe 620,Re 6/6in the old numbering scheme, are six-axle, electric locomotives of theSBB-CFF-FFS,which were acquired as a replacement for theAe 6/6for heavy services on theGotthardbahn.They are the most modern of the so-called "Gotthard locomotives".

Construction and Technology

To reach the necessary tractive effort, a construction comprising six driven axles was necessary. In order to still get good running characteristics in curves, they were built into three two-axlebogiesinstead of two three-axle bogies as on theAe 6/6.The middle bogie can move sideways, and the three bogies are connected by elastic cross couplings. Two of the four prototypes were built with a split locomotive body, whereby the joint may only move on an horizontal transverse axis to allow for changes in gradient, similarly to theRhaetian Railway Ge 6/6^II.

The other two prototypes got a softer secondary suspension instead of the joint, which proved to be so reliable in everyday use that all series locomotives were built this way. Nevertheless, the two prototypes with a split body are still in regular operation. The exterior design is similar to theRe 4/4^II,as are the driver's controls and the conventionaltransformertechnology with fixed running notches, which was applied for the last time for this locomotive. In contrast to theRe 4/4^II,the Re 6/6 has two transformers (one power and one control transformer), which are mounted on the frame between the bogies. Due to the higher roof, the Re 6/6 looks more brawny than the Re 4/4^II,especially when seen from the front side.

Operations

The Re 6/6 is equipped with multiple unit train control together with Re 4/4^II,Re 4/4^III,Re 4/4^IVandRBe 540.In passenger traffic they pull heavy passenger trains over the Gotthard route (as an alternative to a double heading of Re 4/4). In freight traffic they are used all over Switzerland for heavy trains, on the Gotthard route very often together with an Re 4/4^IIor Re 4/4^III.Such a couple, often referred to as "Re 10/10" (both locomotives are Re class, so the couple is Re class; 10/10 means that they overall have 10 driven axles out of 10), is capable of pulling the maximum train weight of 1,300 tonnes (1,300 long tons; 1,400 short tons) on 2.6%gradientsof the Gotthard line. For heavier trains, up to 1600 tons are operationally feasible; an additionalbank enginehas to help push the train in order not to overload thecouplers.

Locomotive 11638 was retired and scrapped in 1990 due to an accident. For the renumbering to theUIC-conforming new numbering scheme in 1992, only the still existing locomotives were considered, thus the 11638 got no new number any more. But the renumbering was never done consistently. During 2005, the UIC numbering scheme was reworked, and 620 001 (instead of 000) was defined to be the smallest number. To make things easy, the scrapped 11638 also got a new number, 620 038. About half a dozen locomotives bore the new numbers at the beginning of 2006.

After two locomotives were tentatively equipped with radio remote control for pushing trains on the Gotthard line (such that the locomotive pushing at the end of the train may be controlled by the engineer at the front), about 30 locomotives were equipped with it in 2000. To make them administratively distinguishable, they got the new designationRef 6/6.

When SBB was divided into passenger services and freight, the first thirteen locomotives 11601–13 remained in the passenger division. On 1 January 2003 they were exchanged against Re 460. Now all remaining 88 locomotives are assigned toSBB Cargo.Due to the reassignment of theRe 460to the passenger division, the Re 6/6 again dominate the freight traffic on the Gotthard line.

The locomotives are assigned to the workshopsErstfeld,BellinzonaandLausanne(Lausanne: 2000, today unknown), revisions are done at the main workshop at Bellinzona.

Pictures

• 
  Re 6/6 11641 in its original condition leading a passenger train in theRhônevalley atMartigny.
• 
  SBB Re 6/6 Nr. 10601 Wolhusen (prototype with split body)
• 
  side view of Re 6/6 11611 with air conditioning
• 
  Front view of Re 6/6 11611 with air conditioning, UIC conforming plug, steps, headlights and red livery
• 
  The first two prototypes 11601 and 11602 were built with joints in the body
• 
  The second two prototypes 11603 and 11604 were built without joints in the body
• 
  Express train in 1983
• 
  SBB Cargo Re 620 046-3 "Bussigny" in Wil SG

See also

• List of stock used by Swiss Federal Railways

References

• This article was mostly translated from theGerman language versionof August 2006.