>>1520219It's easier to do it by line if anything. You end up memorizing and recognizing patters on rail lines based off density and operator.
Example.
Pic related. You can tell just by the design it's a JR Tokai train. It's got that while face and distinct style that JR Tokai trains have. Same with JR East and West. But yeah really it's easier to do by line since most line doesn't have that much rolling stock on it that's different since they have simplified it down a lot in terms of rolling stock.
