• ) The chassis of locomotives 1951 and 1952 were fitted with new bogies (Abt system) and transformers (11 kV) and delivered to the FO as nos. 104 and 105. The prototype bogies (
Riggenbach system) and transformers (15 kV) salvaged from those chassis were then fitted to the last two series production locomotives delivered to the SBB-CFF-FFS Brünigbahn. == See also ==