Articles relating to engines that left the factory as a convertable type, that with a kit of parts could be made into a Roller or a tractor. (usually have a ring of bolts on a flange on the fire box to swap the front end)

Not to be confused with a Conversion were an engines type has been 'permanently' altered from roller to tractor or roller to showmans usually. (major work required to change back)

See Category:Converted steam engines

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