With a relatively compact but heavy SD39 in the lead, an SP westbound descends the Loop late in the day in March 1974.
SP 7930 East roars out of tunnel 9 9and heads upgrade around the Loop with diesel exhaust in its wake.
A trio of Santa Fe cowls approach the Loop with a heavy eastbound manifest.
A Santa Fe eastbound roars uphill below the Loop over one of the many crossings of Tehachapi Creek.
From above Tunnel 10
