In 1900, the Chicago & Alton Railway wanted a photograph unlike anything the world had seen. Not a small portrait, not a standard press shot — a single, sweeping panoramic image of their prized passenger train, the Alton Limited. To get it, they spent $5,000 (roughly $180,000 today) commissioning a camera so large it needed its own construction crew and a steel track to operate on. They called it the Mammoth Camera.

The Alton Limited was built in Pullman, Illinois in 1899 and was celebrated for its perfectly uniform, symmetrical design. Every car matched. Every detail aligned. The railway’s management wanted one photograph that captured the entire train in a single frame — no stitching, no compromise. That ambition led to a pamphlet they later published titled “The Largest Photograph in the World of the Handsomest Train in the World.” It was as much a marketing move as it was a feat of engineering.

The railway hired photographer George R. Lawrence to take the shot. Lawrence was known for pushing the boundaries of the craft, and this project suited him well. To build the camera itself, they turned to J. A. Anderson. The construction took two and a half months and consumed an enormous range of materials. The frame and bed were made from natural cherry wood, chosen for its strength and stability. The bellows — the accordion-like section connecting the lens to the plate — were built from three separate layers: an outer skin of heavy rubber, a lining of black canvas, and a final inner layer of opaque black material. Whitewood stiffened every fold to keep the structure rigid.

The bellows were so heavy they had to be divided into four sections. Between each section sat a supporting frame mounted on small wheels, which rolled freely along a steel track. This allowed the bellows to expand and contract during focusing without buckling under their own weight. The plate holder — the compartment that held the massive glass negative — used a cloth-lined wooden roller curtain made of three layers of light-proof material, held together with more than 10 gallons of cement. Ball-bearing rollers were mounted every two inches inside the holder’s grooves to keep the curtain moving smoothly. When fully assembled, the camera weighed 900 pounds. With the plate holder attached, the total rose to 1,400 pounds.

Moving the Mammoth Camera was its own logistical challenge. A crew of 15 workers handled transport and assembly, carefully shifting the machine from the studio to the shoot location.

Wind and lighting conditions dictated exactly where the camera was placed. Getting either wrong would ruin the exposure.

Once on location, the crew assembled the camera piece by piece. The setup process was deliberate and slow — a single misalignment in the bellows during focusing could throw the entire image out of focus.

With the camera positioned, Lawrence adjusted the bellows to focus precisely on the Alton Limited. The enormous glass plate was then loaded into the plate holder, and the light-proof roller curtain was locked in place until the moment of exposure.

The exposure lasted two and a half minutes. During that entire time, the crew held the camera steady. Any vibration, any shift in the frame, and the image would blur. Lawrence opened the shutter, the team held their positions, and the glass plate slowly gathered the light reflecting off every car of the Alton Limited.

After the shutter closed, the glass plate was removed and transported to a darkroom. Lawrence developed it using a reported 10 gallons of chemicals. What emerged was a clear, crisp photograph measuring 8 feet long — the largest single photograph ever produced at that time. The Alton Limited, car by car, stretched across the frame in perfect detail.

Writes a whole article about a huge camera built to take a massive photo of a train, includes only a low res version of the train photo.
Here is a somewhat higher resolution version of the photo:
https://upload.wikimedia.org/wikipedia/commons/d/da/George_Raymond_Lawrence_Alton_Limited_train.jpg
That little flyer was the only thing the photo was ever used for
Three full size 8′ x 4.5′ prints were made – all three were major exhibits around the world, notably for an exhibition in Paris.
Who’s a handsome train
Takes the shot. Develops. Forgot to take out the dark slide…
With that little camera!?
Who left the lens cap on