Cdf du Nord double framed Outrance 4-4-0 no. 2.843 at dépôt Boulogne on 4/4/1931.
This was one of a class of 51 locomotives built between 1877 and 1885. From the amount of illegible writing on the cab's side sheet i wonder if this is a service or engineer's department locomotive.
[Mike Morant collection]