Short train [First hint: highlighted]

Welcome to my first organized trip to the past!
To start with something unconventional please punch your ticket bump the thread before jumping on the train.
Here is the station. Please jump in before the train leaves!
Mind the gap and the thin layer of oil which is close to your feet. The train company isn't in any way responsible for any injury.

Edit: I forgot to mention that the whole train is intended for Lv. 2 passengers except one car which was accidentally set free of any restriction.
Edit2: After 5h the first hint is highlighted
Edit3: There's a problem for those who feel lost and keep looking at the sky searching for the Pole Star. Unluckly the only tool which will 100% work to find the right path to the station seems to be Photoshop or its trial version (which is quite heavy if i recall correctly).
I'm tring to solve this issue but any free tool I tried so far won't be of any use. Please accept my deepest apologies in the meanwhile.