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Custom built high-wing monoplane (1927)

The Spirit of St. Louis (formally the Ryan NYP, registration: N-X-211) is the custom-built, single-engine, single-seat, high-wing monoplane that was flown by Charles Lindbergh on May 20–21, 1927, on the first solo nonstop transatlantic flight from Long Island, New York, to Paris, France, for which Lindbergh won the $25,000 Orteig Prize.

https://en.wikipedia.org/wiki/Spirit_of_St._Louis

EMD SD70 locomotive

The EMD SD70 is a series of diesel-electric locomotives produced by the US company Electro-Motive Diesel.

Production commenced in late 1992 and since then over 5,700 units have been produced.

While the majority of the production was ordered for use in North America, various models of the series have been used worldwide.

https://en.wikipedia.org/wiki/EMD_SD70_series

Thunder Crane TC20 stiffleg derrick crane

A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a stiffleg derrick. The most basic type of derrick is controlled by three or four lines connected to the top of the mast, which allow it to both move laterally and cant up and down. To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane.

A stiffleg derrick, also known as a Scotch derrick, is a derrick with a boom similar to that of a guy derrick, but instead of using guy wires to secure the top of the mast, it uses two or more stiff members, called stifflegs, which are capable of resisting either tensile or compressive forces.

https://en.wikipedia.org/wiki/Derrick#Stiffleg

https://www.thundercranes.com/offshore-stiff-leg-crane-rental/

Bucyrus Model 50-B Steam shovel

Twenty-five Bucyrus Model 50-B steam shovels were sent to the Panama Canal to build bridges, roads, and drains and remove the huge quantities of soil and rock cut from the canal bed. All the shovels but one were scrapped at Panama. The survivor was shipped back to California and then brought to Denver. In the early 1950s, it was transported to Rollinsville by Roy and Russell Durand, who operated it at the Lump Gulch Placer, six miles south of Nederland, Colorado, until 1978. This steam shovel is one of two (the other at the Western Minnesota Steam Thresher's Reunion in Rollag, MN) remaining operational Bucyrus Model 50-Bs, and is preserved at the Nederland Mining Museum. Roots of Motive Power in Willits, CA has also acquired a 50-B and operates it for the public once a year at their Steam Festival in early September.

https://en.wikipedia.org/wiki/Steam_shovel

Darpa Project Orion (1950-60s)

Project Orion was a study conducted in the 1950s and 1960s by the United States Air Force, DARPA, and NASA into the viability of a nuclear pulse spaceship that would be directly propelled by a series of atomic explosions behind the craft.

Non-nuclear tests were conducted with models, but the project was eventually abandoned for several reasons, including the 1963 Partial Test Ban Treaty, which banned nuclear explosions in space, and concerns over nuclear fallout.

https://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion)

While Project Orion never progressed beyond the conceptual and early design phases, it remains a fascinating chapter in the history of space exploration. Its audacious approach to propulsion demonstrated the creativity and ambition of scientists and engineers during the early days of the Space Age. Although the project was never realized, it contributed valuable lessons and ideas to the field of astronautics and propulsion technology.

https://www.photonicsonline.com/doc/nuclear-dreams-the-race-to-build-project-orion-0001

Northrup Grumman B-2 stealth bomber

The Northrop Grumman B-2 Spirit, also known as the Stealth Bomber, is an American heavy strategic bomber, featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses. A subsonic flying wing with a crew of two, the plane was designed by Northrop (later Northrop Grumman) and produced from 1987 to 2000. The bomber can drop conventional and thermonuclear weapons, such as up to eighty 500-pound class (230 kg) Mk 82 JDAM GPS-guided bombs, or sixteen 2,400-pound (1,100 kg) B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface standoff weapons in a stealth configuration.

https://en.wikipedia.org/wiki/Northrop_Grumman_B-2_Spirit

United Aircraft Corporation TurboTrain

Either way, these trains were fast. On December 20, 1967 a TurboTrain reached 170.8 mph during acceptance testing on a high-speed test track on Penn Central’s mainline. UAC’s creation not only beat the competing Metroliner project, but blasted past the speeds of what the Shinkansen could do back then.

The TurboTrain was put into service in both the United States and Canada in 1968.

[due to being plagued by many obstacles, mishaps, and setbacks] Today, you won’t find a UAC TurboTrain anywhere. Just seven trainsets were built and all met the scrapper. They now only exist in riders’ memories, the internet, and scale models.

https://www.theautopian.com/the-uac-turbotrain-was-americas-failed-plane-engined-high-speed-train-of-the-future/

1938 Railway gun TM-3-12

Humongous Railway Gun (used during the siege of Leningrad). This railway gun of the TM-3-12 model (below) can be seen at the St. Petersburg Outdoor Train Museum. This was not part of an armoured train, but was actually built with others in the late 1930s using guns taken from a battleship and placed on a rail chassis. It was used in World War II, but captured by the Finns and used during the siege of Leningrad. When Finland ended their war with the USSR in 1944, the gun was handed over as part of the peace agreement:

https://www.darkroastedblend.com/2013/05/awesome-armoured-trains-and-rail.html

A railway gun, also called a railroad gun, is a large artillery piece, often surplus naval artillery, mounted on, transported by, and fired from a specially designed railway wagon. Many countries have built railway guns, but the best-known are the large Krupp-built pieces used by Germany in World War I and World War II. Smaller guns were often part of an armoured train. Only able to be moved where there were good tracks, which could be destroyed by artillery bombardment or airstrike, railway guns were phased out after World War II.

https://en.wikipedia.org/wiki/Railway_gun