The Transcontinental Railroad: How America Was Stitched Together by Rail

1,776 Miles Through Mountains and Desert

On May 10, 1869, at Promontory Summit in Utah Territory, a ceremonial golden spike was driven into a railroad tie to mark the completion of the first transcontinental railroad. The event connected the Central Pacific Railroad, building eastward from Sacramento, California, with the Union Pacific Railroad, building westward from Omaha, Nebraska. The 1,776-mile line reduced cross-country travel from four to six months by wagon or ship to approximately six days by rail. A journey that had demanded extraordinary endurance now required only a ticket and patience.

The project had been debated for decades before construction began. Sectional tensions between North and South had prevented Congress from choosing a route. The Civil War removed Southern opposition from the legislature, and President Abraham Lincoln signed the Pacific Railroad Act on July 1, 1862. The act authorized two companies to build the line and provided them with generous incentives: land grants of 6,400 acres (later doubled to 12,800) per mile of track, plus government bonds ranging from $16,000 to $48,000 per mile depending on terrain difficulty.

Two Companies Racing From Opposite Ends

The competition between the Union Pacific (UP) and the Central Pacific (CP) was both collaborative and cutthroat. Each company was paid per mile of track laid, creating a financial incentive to build as fast as possible — and to claim as much of the route as they could.

The Central Pacific faced the harder engineering challenge first. The Sierra Nevada range, with granite peaks exceeding 7,000 feet, stood between Sacramento and the Nevada desert. The Union Pacific's initial stretch across the plains was flatter but presented its own dangers: hostile Indigenous nations defending their territory, and the logistical challenge of supplying construction crews hundreds of miles from any city.

The Chinese Workers of the Central Pacific

When the Central Pacific began construction in 1863, California's white laborers showed little enthusiasm for the dangerous, grueling work. Construction superintendent James Strobridge initially opposed hiring Chinese workers, but labor shortages forced the issue. By 1865, approximately 12,000 Chinese laborers — roughly 80% of the Central Pacific's workforce — were building the railroad.

• Chinese workers were paid $26–$35 per month, while white workers received $35 plus room and board
• They performed the most dangerous tasks, including blasting tunnels through Sierra Nevada granite using nitroglycerin
• Workers were lowered in baskets over sheer cliff faces to drill blasting holes into rock — a job with a significant fatality rate
• An estimated 1,000 to 1,200 Chinese workers died during construction, though no official count was maintained
• Chinese workers organized a strike in June 1867 demanding equal pay and shorter hours; the company cut off food supplies until they returned to work

Despite their essential role, Chinese workers were largely excluded from the Promontory Summit ceremony and subsequent commemorations. The Chinese Exclusion Act of 1882 — the first U.S. law to ban immigration by nationality — targeted the same population that had built the railroad.

Engineering Through the Sierra Nevada

The Summit Tunnel (Tunnel No. 6), bored through 1,659 feet of solid granite near Donner Pass, was the most formidable single obstacle on the entire route. Workers advanced at a rate of approximately eight inches per day, chipping with hand drills and blasting with black powder and later nitroglycerin. The tunnel took nearly two years to complete.

Winters in the Sierra were brutal. The winter of 1866–1867 brought 44 feet of snow. Entire construction camps were buried. Workers dug tunnels through snowdrifts to reach the rock face and lived in snow caves for weeks at a time. Avalanches killed an unknown number — bodies were not recovered until spring.

The Great Race Across the Basin

Once past the mountains, both companies accelerated dramatically across the flatter terrain of Nevada and Utah. The competition intensified to the point of absurdity: the two lines' grading crews actually passed each other in Utah, building parallel grades that would never be used. Congress finally intervened, designating Promontory Summit as the meeting point.

In the final push, the Union Pacific laid a record ten miles of track in a single day on April 28, 1869 — a feat accomplished by a crew of roughly 4,000 men working from dawn to dusk. The Central Pacific had set a previous record of six miles in one day. These achievements reflected both extraordinary physical labor and brutal work conditions.

• Track-laying crews worked in coordinated teams: iron men carried rails weighing approximately 560 pounds each
• Spike drivers hammered 10 spikes per rail, 400 rails per mile
• Supply trains had to follow immediately behind the rail head, creating logistical chains stretching hundreds of miles
• Both companies employed survey crews far ahead of construction to identify the most efficient routes

Impact on Indigenous Nations

The transcontinental railroad cut through the heart of the Great Plains, bisecting the vast bison herds that sustained the Lakota, Cheyenne, Arapaho, and other Indigenous nations. Railroad companies actively encouraged bison hunting — both for sport and as a deliberate strategy to undermine Indigenous resistance. The bison population, estimated at 30 million in 1800, fell below 1,000 by the 1880s.

Conflict was constant. Cheyenne and Sioux warriors attacked railroad survey parties and construction crews. The U.S. Army deployed troops to protect the line, escalating a cycle of violence that culminated in the Indian Wars of the 1870s. The railroad did not merely cross Indigenous territory — it was an instrument of dispossession.

Economic and Social Transformation

The completed railroad transformed the American economy. Freight costs between the coasts dropped by 80–90%. Agricultural products from the Midwest and livestock from the Plains could reach Eastern markets within days. Settlements sprang up along the route — towns like Cheyenne, Laramie, and Reno owed their existence entirely to the railroad.

The land grants alone reshaped Western geography. The federal government ultimately granted railroad companies approximately 175 million acres of public land — an area larger than Texas. These grants created checkerboard ownership patterns that persist in Western land management to this day. The railroads sold much of this land to settlers, profiting twice: once from the land sale and again from the freight revenue generated by the new farms and towns.

The transcontinental railroad was an engineering triumph built on public subsidy, immigrant labor, environmental destruction, and Indigenous displacement. It was simultaneously one of the greatest infrastructure achievements in American history and one of its most morally complex. The golden spike celebrated a connection that enriched some and dispossessed others. Both realities rode the same rails.