The origins of standard track gauge have long been a topic of debate, with some claiming it dates back to Roman times. However, new research suggests that this is not the case. In fact, the use of different gauges was widespread in the UK prior to and after the introduction of standardized gauge in 1846. The article challenges the notion that the Romans had anything to do with the development of track gauge, pointing out that their roads were primarily used for foot traffic and did not involve war chariots.

Source: https://garethdennis.medium.com/the-not-so-glamourous-origins-of-standard-track-gauge-2b5f1ae7e3bc