Gillette (Joint Line)

The Joint Line corridor near Gillette sits at the heart of the Powder River Basin coal fields, delivering one of the most intense freight-watching experiences in North America. The 103-mile BNSF/UP Joint Line—the busiest freight railroad by tonnage in the world—runs through Gillette carrying an average of roughly 70 loaded and empty coal trains daily. During a busy hour, 8 to 10 trains may roll past; even a slow hour typically produces three movements. Most traffic flows along BNSF's Orin Subdivision between Donkey Creek Junction (milepost 0.4) and points south toward Shawnee Junction. The tracks parallel Wyoming Highway 59 south of town, and multiple grade crossings and pulloffs along county roads provide safe, legal trackside access. Expect primarily six-axle GE and EMD power—AC4400CWs, ES44ACs, and SD70ACes are standard—running in distributed-power configurations with mid-train and rear helpers shoving long coal drags up the grades.

Gillette sits at approximately 4,500 feet elevation on Wyoming's high plains, positioned between the Bighorn Mountains to the west and the Black Hills to the east. The terrain is classic Powder River Basin geography: rolling grassland and sagebrush stretching to the horizon with virtually no tree cover. This wide-open landscape is a railfan asset—unobstructed sightlines let you track an approaching train for miles before it reaches your position. Summer skies are vast and intensely blue; winters bring crisp air and snow that contrasts dramatically against dark coal loads and orange BNSF paint. Wind is a constant companion year-round, so bring sturdy tripods and dress in layers. The area south of town along Highway 59 feels distinctly rural despite Gillette's population of roughly 33,000, with pronghorn antelope commonly grazing near the right-of-way.

The Joint Line was born from the 1970s energy crisis, when surging national demand for low-sulfur coal forced competing railroads into an unprecedented partnership. Burlington Northern Railroad and the Chicago and North Western Transportation Company (a Union Pacific predecessor) built the shared line into the Powder River Basin's vast coal reserves south of Gillette. By the 2000s, the corridor handled more tonnage than any other freight railroad in the world, with BNSF and UP jointly investing over $100 million in expansions including dozens of miles of third and fourth main tracks. Gillette brands itself the "Energy Capital of the Nation"—Campbell County's mines have at times produced nearly 40% of all coal used for U.S. electricity generation. The city itself was named after surveyor Edward Gillette, who rerouted railroad tracks near Donkey Creek in the late 1800s, saving the Burlington railroad thousands of dollars. The Rockpile Museum at 900 West Second Street in Gillette preserves the region's coal, ranching, and railroad heritage.

What makes Gillette's Joint Line exceptional is the combination of volume, visibility, and operational complexity rarely found elsewhere. This is the busiest freight corridor by tonnage on Earth—two competing Class I railroads sharing triple- and quadruple-track infrastructure, dispatching dozens of mile-long coal trains daily past wide-open Wyoming prairie with zero visual obstructions. Few locations offer such a clear window into heavy-haul railroad logistics: distributed power operations, meet-and-pass choreography between BNSF and UP trains, and the raw industrial spectacle of trains hauling up to 20,000 tons of coal per consist. The corridor is also an accessible destination—Gillette has hotels, restaurants, and fuel, and the viewing areas along Highway 59 and county roads require no special permission or difficult terrain.