Steam locomotives

This category should primarily be used for sub-categories. For:

Components of a locomotive, e.g. 'cylinder' or 'piston rod', use 'Locomotive parts'
Individual locomotive classes use the relevant country, railway company or wheel arrangement category.
Generic types of steam locomotive e.g. 'Mallet' or 'Crampton', use 'Steam locomotive types'
Locomotive systems or technologies e.g. 'Boiler feedwater' or 'steam circuit', use 'Steam locomotive technologies'