[SOLVED] Organized Freight Passenger Train Event [Bundle leftovers only]

So, I was planning to make a difficult puzzle for this but some of the bigger keys/games I had planned for this turned out to be heavily region-restricted which kind of robbed me of the justification for that. XD

So, instead here it is.

Nice and simple.

Giveaways end on 28th. Levels are scattered but none above 3.

P.S.
Mistakes were made during the creation of some of the giveaways, hence there will be a mismatch between the invite only links you see on my profile and the ones you can access.

Edit - Please take a look at this if you don't get it. I see others have mentioned the same but it bears repeating.
Edit 2 - Two mini-trains in this puzzle.