ARG1
Senior Member
This is completely off topic, but I wanted to share this so here goes. In the context of Moscow, I'd argue that it actually makes a bit of sense, since Lines 3/4 are pseudo local/express versions of each other. I don't want to get into a spiel about the history of these lines, but to make a long story short, the modern day Line 3 was a complete reroute of the modern Line 4 that removed any and all above ground segments. This was done since at the time one of the major goals of the Metro was to function as a civil defense tools that can double as bomb shelters, and as way for people and high ranking officials to escape the city undetected in the case of war. This is why both lines run so close together and in 2 cases have duplicate station names (something that you normally never see in Moscow).The fact that the language uses 2 completely different words to describe 2 similar colors has nothing to do with how objectively similar or dissimilar said colors are. Sky blue is to navy blue almost exactly as the bright green is to the dark green, so your argument should also apply had we used a completely different name for bright green (which we do, sometimes, i.e. "electric lime"). In spoken language the confusion of "which blue line?" is easily addressed by specifying "light/dark blue" (same with green), but looking at a map I don't think most people would confuse the colors or misuse them interchangeably. I, for one, can't imagine using lime green to denote TTC line 2.
That being said if we're talking about line colours in foreign languages, its important to highlight the psycholinguistics angle, which is that the way you perceive the world (in this case colours) is shaped by the language you learned it with. If you grew up learning that navy blue and sky blue are 2 completely separate colours the same way we would differentiate pink and red as being 2 completely separate colours, there's a high likelihood the way you interpret the colours are quite different as well. The same applies in the other direction, many languages see blue and green as being 2 different shades of the same colour "grue". Now as someone who doesn't speak any of those languages, I find the concept to be insane, but to many people, blue and green are very similar colours.