That's He 2/2
Best Greetings
Armin

What a marvellous picture! I like the view of that shunter waiving his arm. On the right-hand edge of this picture we can see one of the two brown (instead of green) first-class coaches built in 1912 in anticipation of a visit by the German emperor (with never materialised). As for locomotive no. 56, it is still active and in good condition as Schynige Platte Railway no. 16. Greetings from Peter