Eight General Electric locomotives - 7539 (GEVO ES44DC),
608 (ex-Santa Fe C44-9W), 991 (C44-9W), 1102 (C44-9W), 5338 (C44-9W), 930 (ex-Santa Fe C40-8W), 5256 (C44-9W) and 4959 (C44-9W) - lead a westbound stack train up the grade on approach to Tunnel 2, near Caliente in Tehachapi Pass, California.