The “Thoroughbred”: Monon's Streamliner to the Bluegrass

Published: April 10, 2026

The “Thoroughbred” was the flagship streamlined passenger train of the Monon Railroad, a modest Midwestern carrier whose identity was deeply tied to the state of Indiana. Though never as famous as the great streamliners of larger railroads, the Thoroughbred embodied the Monon’s postwar ambition to modernize, compete, and maintain relevance in an era increasingly dominated by highways and airlines.

Operating between Chicago and Louisville from 1948 until 1967, the train was both a product of its time and a symbol of the Monon’s final push to sustain passenger service.

Monon F3A #208 with train 5, the southbound "Thoroughbred," as it rounds a curve after crossing the New York Central and EJ&E at Dyer, Indiana on February 10, 1963. Rick Burn photo.

Origins: A Railroad Reborn After World War II

By the mid-1940s, the Monon faced a familiar challenge. Like many regional carriers, it had struggled through the Great Depression and wartime constraints, leaving its passenger services dated and uncompetitive. That changed dramatically in 1946 with the arrival of new president John W. Barriger III, a reform-minded railroad executive determined to modernize operations.

Barriger initiated a sweeping improvement program that included new diesel locomotives, upgraded infrastructure, and—most notably—a complete overhaul of passenger service. At the center of this effort was the creation of three streamlined trains, including the Chicago–Louisville Thoroughbred.

Rather than ordering entirely new equipment, the Monon adopted an innovative and economical approach. It acquired surplus U.S. Army hospital cars built during World War II and rebuilt them into modern lightweight passenger cars. These conversions produced coaches, dining cars, parlor-observation cars, and baggage-mail cars suitable for a streamlined consist. This resourceful reuse of wartime equipment allowed the Monon to field a modern train at a fraction of the cost of its larger competitors.

Inauguration of the Thoroughbred

The Thoroughbred made its inaugural run on February 15, 1948, replacing the older “Day Express.” The name itself was carefully chosen, reflecting Louisville’s deep association with horse racing and the prestigious Kentucky Derby.

Operating daily as Train No. 5 (southbound) and No. 6 (northbound), the Thoroughbred covered approximately 324 miles between Chicago’s Dearborn Station and Louisville Union Station.

The route traversed the heart of Indiana, passing through key Monon towns such as Lafayette and the junction point of Monon itself. This corridor formed the backbone of the railroad’s system, which was laid out in an “X” pattern across the state.

Consist and Timetable (1952)

Streamlined Style and Onboard Experience

Although built from rebuilt equipment, the Thoroughbred was marketed as a modern, streamlined train. It was typically hauled by EMD F3 diesel locomotives, reflecting the Monon’s early embrace of dieselization—indeed, the railroad became one of the first Class I carriers to fully dieselize.

The train’s consist was designed to offer a comfortable and efficient travel experience:

Reclining-seat coaches for general passengers
Parlor cars for first-class service
Dining cars providing full meal service
Observation lounges offering scenic rearward views

The Monon’s distinctive red-and-gray passenger livery, inspired by Indiana University colors, gave the Thoroughbred a unique visual identity. Equipment could also occasionally be found in gold and black, honoring two other state university's, Purdue and DePauw. While not as luxurious as trains like the 20th Century Limited or Super Chief, the service delivered a dependable and respectable level of service tailored to regional travelers.

The same train as seen above going away from the photographer. Rick Burn photo.

Role and Purpose

The Thoroughbred served multiple roles beyond simply connecting Chicago and Louisville.

Business and Regional Travel

The train linked two important economic centers while serving numerous smaller Indiana communities. For many Hoosiers, it was a primary means of intercity transportation.

College Traffic

The Monon was famously known as the “Hoosier Line,” serving several major universities including Purdue, Indiana University, and DePauw. The Thoroughbred carried students, faculty, and visitors along this academic corridor.

Kentucky Derby Travel

Perhaps most famously, the train catered to Louisville’s horse racing culture. Special patronage during Derby season made it a favored way to reach Churchill Downs, reinforcing the appropriateness of its name.

Competition and Decline

Despite its modernization, the Thoroughbred faced overwhelming challenges common to American passenger rail in the postwar era. The rapid expansion of automobile ownership, improved highways, and the growth of commercial aviation steadily eroded ridership. By the 1950s, passenger numbers were declining across the industry, and the Monon—lacking the financial strength of larger railroads—was especially vulnerable.

Cost-cutting measures gradually reduced the train’s amenities. Dining service was scaled back, consists shortened, and schedules adjusted to reflect declining demand. By the late 1950s, the Monon began discontinuing many of its passenger services entirely. Trains such as the Hoosier and Tippecanoe disappeared, leaving the Thoroughbred as the railroad’s final remaining intercity passenger train.

Monon F3A #207 has northbound train 6, the "Thoroughbred," at Dyer, Indiana on November 26, 1965. Rick Burn photo.

Final Years

Through the 1960s, the Thoroughbred soldiered on as a lone survivor of the Monon’s once broader passenger network. It represented both tradition and necessity—maintained in part due to regulatory requirements even as profitability vanished.

On September 30, 1967, the Thoroughbred made its final run, marking the end of all passenger service on the Monon Railroad.

Just a few years later, in 1971, the Monon itself was absorbed into the Louisville and Nashville Railroad, bringing an end to the independent existence of Indiana’s “Hoosier Line.”

Legacy

Though relatively short-lived, the Thoroughbred holds an important place in Midwestern railroad history.

It represented:

The Monon’s most ambitious modernization effort, despite its small size and modest budget.
A creative reuse of wartime equipment
The last stand of passenger rail service on the line
A uniquely regional streamliner tied to Indiana identity

In many ways, the Thoroughbred exemplifies the broader story of American passenger trains in the mid-20th century—an era of innovation and optimism followed by rapid decline.

Today, portions of the former Monon route remain active under modern freight operators, and echoes of its passenger heritage live on in corridors later used by services such as Amtrak’s Hoosier State.

The Thoroughbred was never the fastest, most luxurious, or most famous train in America—but it didn’t need to be. It was a train built for its region, reflecting the character of Indiana and its connections to Chicago and Louisville.

For nearly two decades, it carried students, business travelers, and Derby-goers across the Hoosier State, embodying the Monon’s determination to remain relevant in a changing world. Its story is one of ingenuity, adaptation, and ultimately, the quiet end of an era in American railroading.