(Source: National Transportation Safety Board press release (PDF), December 31, 2014)
WASHINGTON, D.C. — The National Transportation Safety Board (NTSB) issues the following recommendations to the Federal Railroad Administration:
Revise Title 49 Code of Federal Regulations Part 213 to define specific allowable limits for combinations of track conditions, none of which individually amounts to a deviation from Federal Railroad Administration regulations that requires remedial action, but, which when combined, require remedial action. (R-14-75)
Once you have completed the actions specified in Safety Recommendation R-14-75, program your geometry inspection vehicles to detect combinations of conditions that require remedial action. (R-14-76)