same, got a city with 4 train stops in it, no road crossings; trains comes in first station per 20-25 mins, second station once or twice a day, and never to the third station (i closed the 4th station).
i dunno what causes this, this city also have problems like, many of the recycle trucks i sent from my other cities doesn't show up (i sent total of 10, but just 1 of 'em shows up), same with garbage (2-3 out of 15).
i'm building this city since game's release, it's been 7 updates since. so i'm guessing the problem is, existed cities can't patch themselves? i mean bridge tool is working but, other than that, it's just like update 1.
any viable fix? i don't want to create a whole new region with every update.