Prussian Military Railroad Boards.

[ChrisKelly]

Apparently from a museum, with identification tag, then eventually to my collection.  

 

[TracA]

Chris,

 

Interesting items. You certainly have a wonderfully eclectic collection.

 

All the best,

 

Tracy

[Bernd_W]

"Prussian Train Guard Detachement" is onto the back, if I spot it right.

IMO thats a Garde-Train-Battalion.

https://de.wikipedia.org/wiki/Garde-Train-Bataillon

Train is this context is not railway, its supply train or baggage train.

But thats just my opinion as a native, not an expert.