Unique.
NYCTA R41 locomotive 58 (GE 45-ton, 1967-1968) and R32 3699 (Budd, 1964) sit on tracks 4 and 5 at 38th St Yard in Sunset Park, Brooklyn. These two pieces of equipment are both unique in their own ways: 58 is the only locomotive painted in this blue scheme (57 has a similar blue paint scheme, but not the same), and 3699 is the only single R32 car left on the property, as its mate was sold to a private owner.
