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Five foot gauge (1524 mm) is troll gauge.
I will explain:
The first rail line to use five foot gauge, and one of the first major locomotive-hauled rail lines in the US in general, was built in South Carolina in the 1830s. Later, when the Russian Empire wanted to build its first major railway between Moscow and St. Petersburg, a consultant from the Southern US was hired as a consultant. He picked five foot gauge because it had become the most common track gauge in the Southern US, because of that first line in South Carolina. When the US Civil War started, one of several major advantages that the North had over the South, which isn't talked about much, is that most of the North's rail lines were standard gauge. The South meanwhile had multiple track gauges in use, which made rail transport a logistical nightmare. The South lost the US Civil War because of five foot gauge.
Much later during WWII, when the Nazis were invading the Soviet Union, they quickly discovered that it was going to take a lot longer than expected. This was because they were using standard gauge track and the Soviets were using five foot gauge track, which became their most common track gauge because of that first major rail line mentioned before. The Nazis had to re-gauge every inch of Soviet track to move their rail vehicles further into Soviet territory, slowing them down significantly. This slow advance played a role in the Soviets being able to drive out the Nazis. The Soviet Union won WWII because of five foot gauge.
Today, all of the former five foot gauge track in the Southern US is now standard gauge, and Russia and all of the Post-Soviet countries have since re-gauged their five foot gauge track to the more metric-friendly 1520 mm (4 mm less than five foot gauge). The only country that still uses five foot gauge (1524 mm) track is Finland.
