the train is here, all aboard! (giveaways now ended but secret revealed!)

during this train there was a secret giveaway. I dropped a few hints about it as time went on and promised to reveal the secret after the train had ended. so here it is... all of the links throughout the train have a hidden message at the end of the url. for example the link in this post goes to https://www.steamgifts.com/giveaway/TzdSB/read-in-vorlon-voice (referring to the "and so it begins" quote from Babylon 5) and one of the secret messages during the train is "psssst-wanna-know-a-secret-kBuao" with kBuao leading to a giveaway for Sacred 3

so it's that time again and I've got the giveaways prepped but who wants to ride an empty train? sure, there's some nice giveaways for the scenery but I'd be remiss in my self appointed duty to entertain and/or confuse (I suspect I succeed more often at the latter. occasionally even deliberately) if there wasn't something to liven up the descriptions. so... what'll it be?

edit: the train has now arrived at the station. please watch your step when boarding. you can fall over afterwards if you like
edit2: the additional carriages have now also arrived at the station. no need to watch your step this time though. it isn't doing anything interesting
edit3: some carriages were inexplicably locked. passengers may now enter these carriages and mock whoever was responsible
edit4: completing the most diabolically evil series of jigsaw puzzles imaginable by a twisted imagination now gives a hint to the secret giveaway. if you've already completed it you can just load it up again and go straight to the message

and so it begins