Add the ability to paint wagons.

[Artman40]

Just like you can paint locomotives, it would be nice to color wagons as well. Useful if your train transports different stuff in each wagon.

[K3ks3]

in my opinion a quite usefull addition to the game and I don't see why it should not be added to the game
if you transport iron that you have a ironish color and copper a orange color i like this idea

[Artman40]

Imagine if the color of the wagon automatically changes based on what's inside?

[steinio]

Imagine if the color of the wagon automatically changes based on what's inside?

In 0.14 there was a mod for this: https://mods.factorio.com/mods/Sirenfal/Train_Ore_Color

[Vegemeister]

They already get icons automatically based on what's inside, if you have detailed info on. But that doesn't help with seeing the intended purpose of an empty train.

I'm kind of puzzled that you suggested this, if automatic coloring based on the current contents would be sufficient for your use case.