A 79-car Union Pacific MRONY freight fills Big 10 Curve nicely approaching Rocky, Colorado, on Valentine’s Day 2015 afternoon. Seven locomotives are up front, beginning with EMD SD70ACe No. 8559, followed by a pair of GE AC4400CWs—Canadian Pacific No. 9576 and UP 7036. Next up are two General Electric “Tier 4 compliant” ES44ACs—GECX Nos. 2024 and 2023 in vibrant solid blue. Rounding out the consist are a pair of EMD SD70ACes—UP Nos. 8668 and 8362. Seventy-nine cars later and on the upper part of the curve is lone DPU GE ES44AC No. 5309 on the rear.