The Soviet Kalach-Na-Donu Shipyard according to a CIA report dated September 1967

An item reported the fenced and rail served Soviet Kalach-Na-Donu Shipyard with a geographic coordinates 48.40.20 north and 43.32.30 east located in the south part of Kalach-Na-Donu on the east bank of the Don. The shipyard possessed a side-haul marine railway with 2 transverse slipways for newbuilding and repairs, 2 piers, 1 fabrication, 4 shop and 10 support buildings.

Source
The report was published on www.archive.org, document number CIA-RDP78T04759A007300010035-9