It seems it is not Omega zones that causes the problem. My Metropolitan railway station is just mad.
The population flowing into the Metropolitan Railway Station goes up to 598/h and then adding any fully upgraded rezidential building (or several that need some upgrades) causes drop in the number, regardless of the type (Rezidential Zone, Omega zone, Tokyo, …) …down to 510/h. See the pictures below. (And no, the Sims have not moved away.)
The pictures were taken after trains were despatched. When the station is full it shows 0/h. Based on the number of the buildings the flow into the station should be more than 1,000/h, but it collects only 255 passenges every 30 minutes = 510/h.
When I first started with trains, it was during the beta. I had to run rails straight through a large clump of Omegas in my Sunny Isles but to save on too much jiggery-pokery I only had a small station amongst them. So to be honest my passenger flows were not so important. I was more concerned with my mission to link all the islands with rails.
Why?
Hmm, someone somewhere in one of the fan pages said it couldn't be done. Along with a plethora of Moaning Minnie's moaning about everything railway related 🤣
Yep I'm the guy who did it just to prove a point and annoy the naysayers as well 🤣
Eventually stations were moved and replaced and my lines link all the islands still but only needs 3 stations to cope with the demands when I need coins.
Anyhow back to your issue.
I dunno if you noticed or not but there is only one connection on the Metropolitan Station, it's what I would call a Terminal, so if you lose that loop of track next to it, you may be able to squeeze in more houses around it 😀
Unless of course you need the loop to make the station work? I dunno your setup or plans 😆 My Metropolitan is at the end of the line on the 4th island.
As for passenger flow, it varies, if you are in a hurry for coins and chewing up passengers, it will ebb and flow, it's never been something that would cause me much of an upset these days.
Keep On Rolliin'!
