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I had never seen one of these before today. They're great. Way better than reaching for a single pole in a crowded car and wrapping your hand around some stranger's fingers. And If you have the whole thing to yourself you can hook your arm through it.
Well now how am I supposed to enjoy the sensation of someone else's sweaty hand sliding down the pole to slowly touch mine while they remain oblivious of the entire situation?
We're not oblivious ;)
On the other hand you can solidly grope all the bums because you have such a firm grip on the pole.
Yeah, they’re pretty common on newer train cars.
Also, obligatory San Francisco BART picture.
In the métro in Lyon the bar are similar too:
Cool idea, but hooking your arm through it looks like a great way to break said arm if you stop fast.
So don't do that...
I feel like the comment above is from someone who almost never rides commuter rail.
These trains have been designed for people to stand, walk around, and sit unbuckled. They simply don’t stop that quickly.
I ride Atlanta's MARTA for my daily commute. There's a few stops that will spill inexperienced riders to the floor they're so fast.
There's a lot of inertia when stopping on the airport trams I've been on with these. It could very possibly break a weak arm if one were stuck inside two metal bars.
Trains like this don’t decelerate that quickly when you pull the emergency break. If they did, you’d have injuries from standing, not being buckled, not having headrests, etc.
I'm not sure it'd be worse than hooking your arm through a single pole. Presumably in that scenario you're trying to stay put, right? If you're getting shoved hard enough to break your arm by being yanked off the pole you're getting shoved hard enough to crack your skull against one as well.
Realistically, the only way a commenter train is going to change direction or decelerate that violently is if something derails it or slams into it.
Trains like this don’t slow down very quickly, even if you pull the emergency break. That’s why people are allowed to stand, walk, etc.
People are allowed to stand and walk around on these things. They’re not cars. They almost never come to a violent stop. Even the emergency brake takes like 15 to 20 seconds to bring one of these things to a stop.
You say this, but I see unexpected tourists fall from stopping all the time in metro systems all around the world 😂
lol. True dat. They don’t know that you have a wide stance, perpendicular to the train’s direction. You have to ride that bitch like a skateboard.
Okay I have a crazy radical idea that is going to disrupt the entire pole industry:
4-sided poles.
Now bodies touch each other instead of just hands.
I like how you think...
Don't put your arm through it. Just don't. OSHA does not approve putting your arm between metal bars on anything moving.
Sea-tac?
I think it's Denver. I could be wrong though.
Denver was my guess too. I vaguely remember these when I visit my home town.
Yep, you guessed it!
I also took a pic of these a few weeks ago but because the train was eerily quiet 
They're common all over Europe.
These are pretty common where i live. You will be thankful to find a spot to hold on to on rush hour though.
Neat, I like it.
Looks kinda expensive to fabricate (relative to a plain pole), though. I'd probably value-engineer it out if I were designing the train car, TBH.
Here's the thing, though, I know I've seen them, but I couldn't tell you where to save my life. This is gonna be killing me forever now.
Definitely not Atlanta. Never been there.
Denver's trams
OP said Seattle, but I've also seen them at Denver
I just saw that the OP said Seattle airport and that's plausible for me. I'm going to choose to think that was it and save myself the mental agony.
Denver
Also Dulles
Yeah I can see how that's better than the old style. Which airport if you don't mind me asking?
Seattle, on the tram between the main airport and the north satellite gates.
what, nobody is going to mention that this is a stripper pole for my overweight mother?
We weren't going to say anything out of politeness but now that you said it I'm comfortable telling we call her money bags because in the right light the dollar sign tattoos on her ass makes it look like she just robbed a bank.
Damnit, Son! Get off the Google box and go clean your room! I'll be home when the lunch rush ends.
Don't you dare touch my hand!