In the huge covered roundhouse (Rotonde) in Chambéry with a diameter of 108 meters, which is used for the maintenance and storage of SNCF locomotives and railcars, there are four tracks for historic locomotives of the l'Association pour la Préservation du Patrimoine Ferroviaire Savoyard (APMFS). The 2CC2 3400 are a series of four DC electric locomotives initially ordered by the Compagnie des chemins de fer de Paris à Lyon et à la Méditerranée (PLM), built by Batignolles-Nantes and MFO in 1929/1930 and taken over by the Société nationale des chemins de fer français (SNCF) from 1938. These powerful locomotives with 3928 kW and 130 km/h maximum velocity, among the oldest electric machines on the PLM, where they are numbered 262 AE 1 to 4, were first used on the Maurienne line to head passenger trains and then, when more recent series were brought into service, to head freight trains. They were withdrawn from service in the early 1970s. The 2CC2 # 3402 was the last locomotive in the series to be written off in 1974. Preserved and restored, it is now on display under the Chambéry railway rotunda. It is operational, but not allowed to run on the SNCF network.
