An eastbound Union Pacific coal train more than fills Big 10 Curve between Eisele (formerly Clay) and Rocky, Colorado, on a warm Valentines Day 2015. A pair of GE ES44ACs are on the head end (UP No. 7701 and BNSF No. 6345, while a mid-train DPU of three more locomotives can be seen on the tangent on the other side of Big 10 Curve.