Paul:
If you look in the Walker/Weinand book, German Clamshells, on pages 139-141, there is a short discussion and pictures of Reichsbahn Dienst service bayonets.
These railway bayos were marked RBD or they had district/route/train numbers, the one pictures is a matching number Esn 102.
The book doesn't show if there were any RBD marked KS98s, only the K98 types are shown.
John
