A Los Angeles, CA to Chicago, IL guaranteed service intermodal train is leading a fleet of eastbounds trains to sneek through the track work at Hackberry/ Valentine, along the Seligman Subdivision. A track gang was out in force, taking up main two; which resulted in the dispatcher single tracking trains for twelve miles. Four other eastbound trains would follow this Q- train as five westbound got stacked up at Cherokee/ Peach Springs area.