Color trains based on line colors

The color of trains (or at least their locomotives) should automatically change to match the color of the line they're assigned to! It would be a very nice way to tell what a train is and where it's going, at a glance, in addition to making the factory much more colorful :)

After making this suggestion, some very lovely folks on the COI Discord told me it's already in the game 🤦‍♀️. Feel free to ignore / close this suggestion lol