Two examples in NY state:
Former PRR Roundhouse in Ebenezer, NY(south of Buffalo) still has a working turntable, and a mostly intact roundhouse.
hoewver it not being used by a railroad, it is being used by a railcar-repair company.
they do however use the turntable and roundhouse.
The only remaining Roundhouse/turntable combination still in use by a railroad, in NY state, is in use by the Long Island Railroad- Working Turntable and Roundhouse at the Morris Park Shops, Richmond Hill NY
Roundhouses of NY state:
http://gold.mylargescale.com/scottychao ... index.html
There are a lot of operating turntables withouth roundhouses..any many roundhouses still being used by railroads as enginehouses, but without a turntable..but finding both together is very rare.