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In Romania the locomotives pulled 550 tons freight trains from Bucharest over the Carpathians to Brasov. 2 locomotives were able to pull 1000 tons freight trains on the same route with a minimum speed of 30km/h on the climb to Predeal (the Predeal railway station is situated at 1000m, the highest point on the route from Bucharest to Brasov).

Following the delivery of these six machines a further ten were ordered, to be built in Romania, with the diesel-electric equipment supplied from Switzerland. Further orders would continue, eventually 2,404 of the design would be built, including many for various private industries within Romania, and the state railways of Poland, Bulgaria & China. The first ten built in Romania, at Electroputere Craiova with order numbers 1001 - 1010 and road numbers 060 DA 007- 016 had equipment provided from Switzerland. Orders beyond this had the power unit constructed by Masini Resita with Caromet Caransebes constructing the bogies. These initial orders were to be used on replacing steam locomotives on a variety of freight trains. Because of the excellent results from these early orders they were selected to replace the Pacific steam locomotives on the passenger routes from Bucharest to Constanta, Urziceni - Galati & Rosiori - Craiova.

The last locomotive ordered was completed in 1981, with 060 DA 1407 being allocated to Satu Mare depot.

With the CFR fleet of 060 DA locomotives just exceeding 1,400 when the last one was built, there were bound to be changes within such a large fleet. The maximum speed of the locomotive was 100 km/h but full power was only available to about 80 km/h, beyond this the useful power of the locomotive diminished. At Electroputere the traction motors were modified to allow the full power range for speeds of almost 100 km/h.

Other locomotives had their maximum speed increased to 120km/h by modifying the traction motor gear ratios (these locomotives were classified 060 DA1).

The first of the class 060 DA 001 was retired from Cluj depot in 1994, but because of its historic nature it was restored for museum display.

NB: the the locomotives built in Romania, the numbering started at 060-DA-001 for every new customer, this is why there are multiple locomotives registered 060-DA-001 - http://transport-in-comun.ro/forum/viewtopic.php?f=69&t=73


In 1956, the Romanian State Railways (CFR) commission the Swiss industry to design and built a diesel-electric locomotive with a Co'-Co' axle arrangement, all 6 axles motorised, 2100 hp (1550 kW) generated power.

For this purpose, a consortium is formed, consisting of:
- the Swiss Locomotive and Machine Works (SLM) in Winterthur, mainly in charge of the mechanical parts of the locomotive and the overall general assembly of the locomotive;
- Brown Boveri & Co in Baden (BBC), mainly in charge of the installation of the electrical equipment;
- Sulzer Brothers in Winterthur, in charge of the diesel engine.

Sources: https://www.railnet.ro/viewtopic.php?f=119&t=4097, https://www.derbysulzers.com/cfr2100.html



The contract is signed in April 1956 and included:
- the purchase of 6x diesel electric locomotives and the necessary parts (ten diesel engines and the complete electrical equipment) to build another 10x units in Romania for 6.9 M$;
- a licence to manufacture this type of diesel-electric locomotive in Romania;
- the transfer of technology and equipment necessary for the production of 40x diesel-electric locomotives for 1,2 M$.

Sources: https://railnetromania.blogspot.com/2013/11/Locomotiva-Diesel-electrica-060-DA-2100-CP.html, https://www.railnet.ro/viewtopic.php?f=119&t=4097


The first 6x locomotives of the series saw the light of day in 1959 in the workshops of the Swiss Locomotive and Machine Works (SLM) in Winterhur. At the time, the locomotive manufacturer was also building the Ae 6/6 electric locomotives for the Swiss Federal Railways (SBB) and there are similarities in design, especially regarding the construction of the three-axle bogie and the way of supporting the locomotive casing on it. The manufacturing numbers of the 6x locomotives (4246 - 4251) are also located right in the middle of the Swiss series, whence comes the unofficial (factory) name: Ae 6/6.

Technical details:
- Sulzer type 12 LDA 28 diesel engine
- length over buffers: 17000 mm
- maximum width: 3000 mm
- maximum height: 4272 mm
- distance between pivots: 9000 mm
- bogie wheelbase: 4100 mm
- wheel diameter: 1100 mm
- weight with 2/3 supplies: 114 t
- axle load: 19 t
- traction force at start: 32000 kgf
- power: 2100 hp (1546 kW)
- maximum speed: 100 km/h

Initially, the locomotives are equipped with multiple traction control, which allowed the driving of two or more locomotives from a single driving position.

Being considered mainly locomotives for freight trains, they were not provided with train heating installations, which determined the use at CFR, for heating passenger trains, WIT wagons and even towed steam locomotives!

Before beeing delivered to Romania, all 6x locomotives undergo acceptance trials on the Swiss railways network from May to October 1959, mainly on the route from Winterthur to St Gall or Romanshorn.

The first locomotive also made a trip up the northern bank of the Gotthard line as far as Goschenen. This involved a climb of 600 meters over 28.6 km. With a 66 axle freight totaling 550 tons, the locomotive was able to reach 22 km/h in 3 minutes. During another test, a 94 axle 1066 tons freight train was pulled by one locomotive over the 55 km route from Winterthur to Romanshorn. Under full power, 60 km/h were maintained over minor gradients near Weinfelden. On the return trip, with the whole of the train stopped on the ruling grade of 1 in 83, a speed of 30 km/h was reached after three minutes.

Two locomotives, coupled in multiple traction, were tested on the Romanshorn route with a trailing load of 1,227 tons. With one engine shut down the train was restarted on a 1 in 200 grade accelerating to 40 km/h within three minutes. The performances registered during testing were equal to or better than the paper calculations established for these new locomotives.

Sources: https://www.railnet.ro/viewtopic.php?f=119&t=4097, https://www.derbysulzers.com/cfr2100.html, https://railnetromania.blogspot.com/2013/11/Locomotiva-Diesel-electrica-060-DA-2100-CP.html


In Romania, these units are registered 060-DA-001 to 060-DA-006.

Sources: https://railnetromania.blogspot.com/2013/11/Locomotiva-Diesel-electrica-060-DA-2100-CP.html


2x 060-DA locomotives are sent for trials to Poland in 1963.

One year later, during the Poznan International Fair in Poland, a contract is negotiated for the delivery of 30x units in 1965, registered as ST43 by PKP. Many more will follow.


In 1975, the Romanian State Railways (CFR) introduce a new numbering system according to UIC standards at the time. The new registration numbers format for these locomotives changes from 060-DA-XXX to 60-XXXX-Y.

Sources: http://www.railnet.ro/viewtopic.php?f=79&t=111&start=100

Latest update on the 6th of August 2020 at 17:41

Contributor(s): Tudor C.

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