Ian,

Looking through my sources, most of the D XIs in the photos are hauling passenger trains or mixed trains. However there is a wonderful shot in Zintl's "Die letzte Bayerischen" of a D XI with goods train - PwPostL bay 06, a covered van, two or three stake wagons and what look like another covered wagon.

The atmosphere of this 1935 scene is enhanced by a cart in the foreground being hauled by a pair of cows!

Bayern Report has this to say about the brakes:

"The Prüssmann-shaped chimney in all locomotive classes is made of cast iron. In front of it, on the Kraussschen engines the silencers of the Hardy brake are installed. On the Maffei-built D XIs they were initially behind the chimney and, later, on the left hand side. The silencer of the air resistance brake is installed at the side of the chimney, usually on the right.

From about 1904, the air resistance brakes began to be removed and the Hardy brakes replaced with Westinghouse brakes, although when negotiating steep inclines, such as those which frequently occured on Bavarian branch lines, the reliable and easy-to-regulate vacuum brakes are preferred to this day. Of course, Exter handbrakes were also provided and situated by the rear cab wall."

Hope this helps,

Paul, of (formerly Prussian-occupied) Lower Saxony