The Radilroad Radio Rules

In 1966 The Chesapeake and Ohio Railway Co. and the Baltimore and Ohio Railroad Co. made a pamphlet to enumerate the rules for radio use on their rail lines. Mostly it lists FCC operating rules and it explains as much in the preamble (the typo is theirs):

"THE PURPOSE OF THIS BOOKLET WHICH CONTAINS BOTH FEDERAL COMMUNICATIONS COMMISSION REGULATIONS AND RAILROAD RADIO OPERATING RULES, IS TO SERVE AS A GUIDE TO THOSE EMPLOYES USING RADIO IN THE PERFORMANCE OF THEIR DUTIES."

The railroad communications system rules covered the transmission of data between fixed points, moving points and between moving equipment and fixed points. Unlike most other applications, a railroad certainly has all three. It doesn't list anything as specific as frequencies I'm afraid, but it is a quick tutorial that was probably handed out to every yard man that might use a radio

You can download it all 

HERE