Many major U.S. railroads and rail transit agencies have made available Contractor Safety Guidelines. Here is a recap of those available guidelines.
BNSF
Canadian National
Canadian Pacific 
CSX Transportation 
Kansas City Southern 
Norfolk Southern 
Union Pacific 
MTA (New York City)
WMATA (Washington, DC)
CTA (Chicago) 
MBTA (Boston)
New Jersey Transit

“For the FRA Part 219 and 243 implementation, the NRC was especially helpful for us in that they provide member companies guidance in how to comply with the ever-changing federal regulations. We also value the annual safety awards which we use to motivate our employees to uphold the highest level of safety as well as in business development materials.”
President, Civil/Rail
Ragnar Benson Construction, LLC.