Saw blade sharpener?

[Aunt Phil]

Here is one of the ones on rails. I think this one was Lynn Dowd's. The one shown on a shelf is one of mine.

Pawpaw the ones pictured are dressers, NOT cutters.
Dressers were used as part of the PM routine on the machine after stoning the commutator to remove glaze periodicly.  The dresser scrapes the mica to remove carbon residue that causes arcing.

Old DC machines often got dressed 4 times a year before Maintenance Managers were invented along with Generator Technicians.