| 1 | SILX | The Silurian Oil Co. | 7/1930-7/1932 | | NAKINA |
| 2 | SILX | The Silurian Oil Co. (W.C. McBride, Inc.) | 7/1935 | | NAKINA |
| 3 | SILX | W.C. McBride, Inc. | 7/1937-1/1941 | | NAKINA |
| 4 | SILX | Southern Indiana Liquified Gas Co. | 1/1950 | | NAKINA |
| 5 | SILX | Jeffersonville Silgas, Inc. | 1/1952-10/1966; eliminated 10/1969 | | NAKINA |
| 6 | SILX | S & I Locomotive Services, Inc. | 7/2005 (not listed) | | NAKINA |
| 7 | SILX | The Silurian Oil Co. (W.C. McBride, Inc.) | Apr-38 | | NRHS |
| 8 | SILX | Jeffersonville Silgas, Inc. | 1/52-10/66; eliminated 10/69 | | NRHS |
| 9 | SILX | *W. C. MCBRIDE, INC. [SILURIAN OIL CO.] | | | PWRC |
| 10 | SILX | *JEFFERSON SILGAS, INC. [SOUTYHERN INDIANA LIQUIFIED GAS CO.] | | | PWRC |
| 11 | SILX | +S & I LOCOMOTIVE SERVICES, INC. | | | PWRC |
| 12 | SILX | S and I Locomotive Services | | | RSRV |
| 13 | SILX | S & I LOCOMOTIVE SERVICES INC | | | SCAC4 |