SCP Foundation

Abandoned subway stations are awesome. If you aren't convinced, take a look at this:
https://www.thrillist.com/culture/photos-of-abandoned-subway-stations-around-the-world-deserted-underground-tunnels

Or this:
https://youtu.be/6xSzU0oM4mM

I'm trying to write a creepy SCP based around this environment. However, I want it to be more original than "haunted underground complex."

Here are some ideas.

A lot of these stations still have working tracks that subways pass through. What if, when standing on the platform and viewing a train passing by, you can see monsters staring out of the windows. Or maybe people's faces are replaced by something horrific.

My personal favorite idea would be that the station goes on forever, adding new turns and getting freakier as it goes. But I feel like that would be too much like daedaelus' labyrinth, or SCP-184.

I understand that this needs to be a kind of story at some point, but I need help developing a premise from a setting.

Throw literally anything out there, the more ideas the better. Preferably exetremely creepy. Let's try and narrow something down.

A lot of these stations still have working tracks that subways pass through. What if, when standing on the platform and viewing a train passing by, you can see monsters staring out of the windows. Or maybe people's faces are replaced by something horrific.

I've actually seen a lot of "you see [horrifying thing] when you're not expecting it" done, to the point where I'm kind of jaded. Not too sure about this approach, since it feels… overly commonplace?

Here's my take on it:

I've always had a fascination for abandoned subway stations. My father used to tell me of stations he would pass-by in the London Underground during the 60s/70s that trains mysteriously never stopped by.

Of course, the Real Ghostbusters cartoon episode "Knock, Knock" furthered that interest where Doomsday came to the living world's present day, and the NY subway became hazardous featuring sentient worm-like monsters for trains, carrying the damned around endlessly:
http://2.bp.blogspot.com/-RvafNYDvd0w/T_iCa3W8rwI/AAAAAAAAA3I/hYoECaRPBLA/s1600/gb+PossessedSubwayTrains03.png

And the awful Matrix sequel that still perked my interest with its subway station that's ordinarily inaccessible to the rest of the virtual world. The video game "Metro 2033", the list goes on.

The problem here, is originality. Stations over and underground are merely a part of trains. Trains, especially ghost/haunted trains, are done to death. How do we come up with a new interesting twist or spin on the concept? Zyn has pointed this much out.

Hmmmm, perhaps combine the Dune worms with Subway trains? And they've made their own network beneath an entire major city?

What about part of a train car that when you look out its windows, you can see your own death on the walls? Like as in you witness how you did when you look out a window? No? Ok 😂