Columbia subject headings:
Railroad accidents--Investigation--United States.
Railroad accidents--Texas.
Railroads--Employees--Training of--United States.
Railroads--Texas--Safety measures.
United States. Federal Railroad Administration--Rules and practice.
Harvard subject headings:
Railroad accidents--Investigation--United States.
Railroad accidents--Texas
Railroads--Employees--Training of--United States.
Railroads--Texas--Safety measures.
United States. Federal Railroad Administration--Rules and practice.
Princeton subject headings:
Railroad accidents--Investigation--United States.
Railroad accidents--Texas.
Railroads--Employees--Training of--United States.
Railroads--Texas--Safety measures.
United States. Federal Railroad Administration--Rules and practice.