600 class or Class 600 may refer to:
British Rail Class 600, proposed hydrogen fuel cell-powered multiple units Caledonian Railway 600 Class, 0-8-0 steam locomotives FS Class 600, Italian 2-6-0 steam locomotives New South Wales 600/700 class railcar NS Class 600, diesel locomotives South Australian Railways 600 class (diesel) South Australian Railways 600 class (steam), 4-6-2 locomotives