A sorta long train, and a jigidi or 3

I'm ill, and feverish, and struggling with many things I can't control; but, I did find a bunch of old keys down the back of the sofa!

I hope I've done this right, as my brain is not doing the thinking thing very well at the moment. Please let me know if I managed to screw anything up.

Enough waffle - enjoy some jigidi art, find the code, and jump on the 'keys-I-accidently-collected-for-months-without-using' train! All aboard!

https://www.jigidi.com/solve/i2v2lzyi/

https://www.jigidi.com/solve/v440nxam/

https://www.jigidi.com/solve/ljmdshzt/

Edit: stuff I probably should have added earlier: There are 60 giveaways total in the train, and they end around the 23rd or 24th of October (depending on your timezone)

Edit 2: Giveaways have now ended! Thank you for all the entries and comments, and congratz to the winners!
I used ESGST to make the train, and send out to all the winners - but from my end it looks like something might have gone a bit screwy; please, if you received your key, mark it as received asap so that I can stop panicing :P (on the other hand - if I've marked it sent, and you haven't received a key, let me know!)