We got some weak minded lazy individuals in here.
>>3024408 lb
>>3024231 lb
>>3024181 lb
Easy answer in Wikipedia.
"The National Transportation Safety Board is an independent U.S. government investigative agency responsible for civil transportation accident investigation. In this role, the NTSB investigates and reports on aviation accidents and incidents, certain types of highway crashes, ship and marine accidents, pipeline incidents, and railroad accidents."
Probably historical. Historically many pipelines are on railroad rights of way.
Pipeline is def part of their mission.
Took me 5 seconds to look it up. How long did it take you to ask someone else to look it up for you, lazy faggots?