"It's hard to explain."

It's kvass in Latvian, I assume that spelling carried over to English since it's already romanized and the Polish kwas is a bit clunky.

Well, it is the second-most forgettable train line, after the Skokie Swift.

Yes it does.

Fair! Although, counterpoint:

Why do these mouthbreathers always insist on violating the US flag code with their fashion mistakes?