You can find the Passenger HOS Compliance Manual (NJ Transit) or the FRA official manual (DOT.gov), which clarify recordkeeping and compliance policies under Title 49 U.S.C. 🏛️ Government Records & Archives
Depending on what you are looking for, the "topic" might be one of the following: 🚆 Federal Railroad Regulations (HOS)
To help you better, could you tell me or what subject (like gaming, law, or engineering) you were researching? I can then find the specific "interesting guide" you're after.
If you found a file named on a forum or a file-sharing site:
The sequence often appears as a or page index in large federal document releases: