The class was numbered 3.1201 to 3.1290 before the nationalisation of the Chemins de Fer du Nord in 1938, and were the most prestigious locomotives of the company.
Before the nationalization of the Chemins de Fer du Nord in 1938, locomotive class 3.1201 to 3.1290 held a distinguished place within the company's fleet, representing its most esteemed locomotives.