Midi n° 1921 (SACM Belfort n° 5633/1907). Prototype of 1921 to 1934 serie. Herdner's second order of Atlantics with a larger grate area, approximates to Nord serie 2.661. To PO-Midi as 221-921 to 934. All the serie was withdrawn before 1938. Collection Jean-pierre Vergez-larrouy (jean-pierre.vergez@tele2.fr)