Hi! I see you have the DM closed, so I'll post it here:
SPOILER:
I found out (as I see others did, so probably you are already aware) that when holding the first body part (arm), you can just continue walking the train and end up with everything dark. When I saw the torso, I did try to add the arm to it, but there was no indication that I was able to do so, and after not working for a couple of minutes, I continued walking.
I think that it's kind of confusing that sometimes the interaction is with the LMB and sometimes with the "e".
The load and save wasn't working for me, so I had to start again to test more about the arm, but didn't have the patience to get to that part again.
I don't know if the jump on the train image after the last wagon is intentional or not, but as you go on, it's more and more evident.
Oh, and the textures on the blue walls have some kind of glitch to me, any settings used didn't change. I have AMD 7900XT GPU
In any case, good work, nice ambient.