Can anyone identify this shoulder board?

[tropenmilitaria]

hey guys,
a good friend of mine recently received some German items from a vet's family including this shoulder board. Could anyone identify this sew on board? I have never seen one like this. Thanks in advance.
andy

[tropenmilitaria]

here is the board...

[Abzeichen]

My guess is WWI Prussian railroad or transport. However I could be wrong.

[Laurence Strong]

Bahnschutz Oberzugführer

[Johnny R]

board

Bahnschutz Oberzugführer

Railroad protection police someone may know the unit location "30"

[tropenmilitaria]

Thanks guys! I will tell my friend the findings....he might be joining the forum shortly as he is really into wwii german items.
andy