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In page R29/R99 (New York City Subway car):
"After being rebuilt by Morrison Knudsen in Hornell, New York as Redbirds between 1985 and 1987 under the R99 retrofitting program,[2] they were split into two groups with different propulsion equipment. The Westinghouse cars, 8570-8687, ran on the 6 service alongside the R36s and some Westinghouse R36WFs, while the General Electric cars, 8688-8805, ran on the 2 and 5 services with the R26 and R28 cars.
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