From Stephenson's Rocket in 1830 to Mallard (still current World Steam Speed Record) in 1938, trains were changing rapidly. Rail was being built out
everywhere, as fast as possible. From 1830 to 1900 they were the cutting edge of human travel technology, that only really transferred elsewhere with the rise of the car, tram and bus in the very late 1800s, but mainly 1900 on. Fast travel was a new big deal in comparison to the slow discomfort in a coach that had preceded them. Even with an efficient network of coaching inns, and fast team changes, they were expensive, slow, uncomfortable, and unheated.
Competition was intense - by 1900, the UK had a couple of hundred train companies, many in parallel competition with competing lines, sometimes competing stations in the cities too. 20 years could easily be the equivalent of 5 or 10 years of computing in the 1980s or 1990s. We'd immediately pick up similar anachronisms in halt and catch fire, or the latest hacker movie. Or loads of 1940s or 1970s cars in a movie set in the 60s.
As a European, train emoji just look odd for being wild west, as they're so unlike the common European designs (mainly from the cow catcher and silly funnel shape).