Colour theme in metro and a mother's perspective!

Yet another addition to my list of "mother's perspective" on System Engineering!

Today we traveled in Pune Metro along with kids. At first, I really liked that idea of maintaining colour theme inside the train based on the line's name, like purple line trains in purple color and blue line trains in blue colour.

But at the end, I had to hold my head when kids wanted to travel in the train with their favorite colour theme, but not in the one that actually goes to the required destination!

I wouldn't have thought of this use case, even if I myself was designing those system requirements related to colour theme!