Unit Ad.123 is part of this class Ad.12x of italian operator FSE. These are 10 railcars previous build by FIAT for Italian State Railways (FS) with others in years 1956-1963 as ALn668 series 1400 (http://trainspo.com/model/1905/ ). In the 2000 these 10 railcars in object were sold from FS to FSE and restored at Leon D'Oro company in years 2001-2002 and turned into 5 bined set (UIC axles: (1A)(A1) + (1A)(A1) ) with fixed composition on regular service and only uncoupled for maintenance like in this picture.
These are 10 railcars previous build by FIAT for Italian State Railways (FS) with others in years 1956-1963 as ALn668 series 1400 (http://trainspo.com/model/1905/ ). In the 2000 these 10 railcars in object were sold from FS to FSE and restored at Leon D'Oro company in years 2001-2002 and turned into 5 bined set (UIC axles: (1A)(A1) + (1A)(A1) ) with fixed composition on regular service and only uncoupled for maintenance like in this picture.