Royal Bavarian State Railways No 1400
This appears to be a locomotive built for the Royal Bavarian State Railways (Königliche Bayerische Staats-Eisenbahnen or K.Bay.Sts.B)
I'm not sure what the wheel arrangement is, a photo of a model of this loco listed it as a AA1 (2’a A 1 n2v) and was later rebuild into a bay. 2’B h2. In 1923 it received the number 36 861..
This photo was taken from an old original photo we came across while helping to clear the house of a deceased friend. I have uploaded it to Flickr in the hope that it might be interesting to steam enthusiasts.