Claim: In the Table of locomotives (railway locomotive that produces its pulling power through a steam engine) the class are categorized as F6 and F6-a and it was built from January 1930 to November 1931.
Evidence: A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine. F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 January 1930 F6 February 1930 F6 February 1930 F6 March 1930 F6-a October 1931 F6-a October 1931 F6-a October 1931 F6-a October 1931 F6-a November 1931 F6-a November 1931 F6-a November 1931 F6-a November 1931