The Transportation Technology Center (TTC) is a railroad equipment testing and training facility located northeast of Pueblo, Colorado, owned by the Federal Railroad Administration (FRA). It was built in 1971 as the High Speed Ground Test Center (HSGTC) for the Department of Transportation (DOT) and its original purpose was to test several hovertrain concepts. When those projects were completed in the 1970s, the site was handed to the FRA.

A hovertrain is a type of high-speed train that replaces conventional steel wheels with hovercraft lift pads, and the conventional railway bed with a paved road-like surface, known as the track or guideway. The concept aims to eliminate rolling resistance and allow very high performance, while also simplifying the infrastructure needed to lay new lines. Hovertrain is a generic term, and the vehicles are more commonly referred to by their project names where they were developed. In the UK they are known as tracked hovercraft, in the US they are tracked air-cushion vehicles. The first hovertrain was developed by Jean Bertin in the early 1960s in France, where they were marketed as the Aérotrain before being abandoned by the French government.