Interesting game. It would be nice to see what upgrades too when looking at the ones you already have purchased, and maybe grouping them by category so it's easier to tell which car types have been upgraded the most.
Looks like I accidentally deleted part of my comment before I posted. I meant to say it would be nice to see what the upgrades do when looking at the View Upgrades, or a current "status" of how much faster your train is, damage upgrades for the cars, etc