 The 140.Cs, hired out to CFTA, were the last steam locomotives in regular day-to-day commercial use on the French railway network.Their final area of operation was the CFTA Réseau Franche-Comté, whose HQ was at Gray, Haute-Saône.Operations were mainly centred on the line from Gray to Châtillon-sur-Seine and Troyes (in Champagne).