You can now unlock a Bouncy Wrecking Ball by completing the required Steam achievements. Hit it with your mouse cursor and see it fly around and knock about and crush the zombies!
I've added being able to buy special items from the Buy Upgrades and Items menu while you're driving your train so now you can call an air strike and more anytime.
Clicking on the locomotive behaves a lot better and enemies on top of the locomotive will no longer block the mouse click. The Buy Upgrades and Items menu will open so no need to stress anymore. You can buy a health pallet whenever you need to.
Collecting Upgrade pallets will no longer bring up the Upgrade menu. It was a bit disruptive to game flow. Instead just click on the locomotive or wait till you level up to access the Upgrade menu.
Oh and a word of caution. Don't let the time pass 31 minutes. You've been warned :D