SP, Kyle Railways and later the San Diego and Imperial Valley Railroad operated the line, paying a fee to the SBC, and later to FNM.
The railroad had previously also made repairs to the desert line from Division, California to Plaster City, California – including two burned trestles which had forced Kyle Railways to quit – and started work on Tunnel Eight by subcontracting Walter H. Barber & Son, Inc. and Morrison-Knudsen until the early 90's.
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