Virginia Smelting Company is listed on page 687of the July 1945 ORER.
The reporting marks are V.S.X.
The car list is similar to that posted by Dave--some cars added, some cars removed--a total of 33 cars. There IS 116 and 119, there is NOT 120 and 121.
April 1961 still shows VSX. The reporting marks for the company (and the name, sort of) were changed between that date and July 1965 to VCSX.