Category: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'