Could the train be the desert Wind, its Departure from LA was same as the SWC after Vegas followed/part of the CZ route
It certainly was not the DW, as (1) the DW ceased in 1997, and also (2) the quake hit at 2:46 AM. The DW followed the same route as the SWC between Barstow (actually Ludlow I think) and San Bernadino, but Hector is east of Barstow (before the DW met the SWC route). And the DW did not even get to Las Vegas until (I forget) like 7 or 8 AM. At 2:46 AM, it would have been about 1/2 way between SLC and LV (if it were still running).