Columbia subject headings:
Railroad accidents--United States--Periodicals.
Railroads--Safety appliances--United States--Periodicals.
Harvard subject headings:
Railroad accidents--United States--Periodicals.
Railroads--Safety appliances--United States--Periodicals.
Princeton subject headings:
Periodicals.
Railroad accidents--United States--Periodicals.
Railroads--Safety appliances--United States--Periodicals.