In a factory yard north of Moscow, among the scrapyard of rusted and decrepit machines of Soviet times, a piece of Cold War history sits frozen in time. Its nose juts upward, sleek as a fighter jet.

In the 1960s, engineers experimented with mounting jet engines onto railcars to create ultra high speed trains. One prototype set speed records that still stand today, proving the concept could work ...

A travel startup is charging a staggering $18,500 for a six-person charter aboard a private jet–style rail car hooked onto an Amtrak train, so passengers can travel in “ultimate luxury” with a chef, ...