Towards the end of the Second World War, concrete plans were made for a new, light type of locomotive. Special attention was given to the ability to negotiate curves at higher speeds. The basis for this project was the heavy Ae 4/4 251 of the BLS. From 1946 on 50 new express locomotives were delivered. They were used for the express trains on the east-west axis.
SLM did the mechanical construction, while MFO directed the electrical design and shared the work with BBC and SAAS. From 1946 to 1951 locomotives 401 - 426 and 427 - 450 were delivered in two subseries. The locomotives of the second series were built without electric brake. The multiple control, which was built in the first six locomotives and later recreated in the entire first series, was not used in the second series.
From 1965 they were in use as 10001-10050. The name Re 4/4 I was given when the type
Re 4/4 II was delivered. In the 1960s they were displaced into other services when the above-mentioned Re 4/4 II and the RBe 4/4 came in to service. Between 1996 and 1998 the locomotives were decommissioned. Operational remained the 10001 in Olten and the 10044 in Rapperswil. A few are still operated by private railroad companies.
In order to insure free passage for travelers inside commuter trains, up to number 426 end wall doors and lateral corridors were installed. For the first time brake slack adjuster "Stopex" was used in SBB locomotives. For starting under heavy load, a pneumatic axle load compensation was installed. A major weight reduction was achieved by the newly developed BBC transformer with radial lamination. The "Westinghouse" control and manual brake valves were replaced by those of the Oerlikon Company. The G / P / R switches were simplified, the position "G" was removed. In the mid 60's the wheel spokes were reinforced.
Between 1958 and 1960 the locomotives were re-numbered to 10001 - 10050.
Field of application and Depot affiliation of the locomotive 10001
- 1946 test drives Depot Bern
- 1946-1953 Zurich
- 1953-1977 Lucerne
- 1977-1994 Bellinzona
- 1994-1996 Olten
- 1996 Historical vehicle Olten
- Care by Team 10439 Historical Loks Olten