I've started implementing special pallets that you can gain based on the achievements you've accomplished. Note this is for the full version of the game, not the demo. The first one is the EXP magnet pallet. They'll appear fairly frequently as you drive along and when you pull in one of these pallets you'll automatically draw in every EXP gem without having to hover your mouse cursor near them. More cool pallets linked to achievements are on the way!
I do try to watch as many streamer videos as I can to help understand where the game is confusing and a common one that is not clear is that YES the locomotive does crush zombies! I've now put a cow catcher graphic in front of the locomotive that turns on when the train is in motion. I've also added a new ability to unlock called Crusher and this is for increasing the crushing damage of the locomotive!
Each locomotive does have its own array of weapon types and I've now assigned a starting weapon to each locomotive type to distinguish them a bit more. I need to improve the UI so that you can see what weapons each locomotive type has when are you selecting a loco.
Good luck Choo Choo Engineers!