600 (the class SD40) seems to be having injector troubles as a southbound train swtiches Heavener before proceeding on to Shreveport. Nice lash: 700 (1st of only 4 SD40X built), 600 (1st KCS SD40), 685 (SD40-2), 4115 (GP30). The Geep will be set out as the Mena switcher.