Regg,
Check out Walthers suburan elevated commuter station (933-4563), which may offer you an economical solution to your problem. I just opened my kit package, and discovered that with a smidde of kit bashing, I can convert it into a four-track commeter line and hi-speed passenger line, somehat like NJ’s Amtrack line between Newark and Middlsex, NJ.
The kit suggests two formats, a single two-foot canopied platform with an inbound and outbound track on each side, or two one-foot canopied platforms, with both inbound and outbound tracks between the two platforms.
Either design allows you to only have TWO tracks, inbound and outbound, straddling the platform.
BUT, because Walthers suggests these two designs, it’s kit doesn’t offer the flat styrene roof/roadbed. Instead, it recommends you deside which design you want and then buy styrene sheets for the roof/roadbed that you can cut to fit.
Now to your problem. Why not do what I plan to do with the kit? Kitbash the WIDTH of the structure’s retaining walls with a few scraps of styrene, to allow FOUR tracks. Yeah, this will require a bit of chopping and channeling, but then you can kitbash the two kit platforms for as long as you want, while still having a a 12-inch canopy on each platform.
Your layout then can consist of an inbound commuter line, the commuter platform, and then the outbound commuter line. Immediately adjacent to the commuter outbound line, you can have the inbound high-speed passenger line, the passenger platform, and the oubound passenger line.
Oh, yes. Since the kit supplies two outside stairs to the single platform, which would disgourge your passengers directly onto the tracks of on-coming trains – if you try my four-track idea – you might try another idea. Instead of installing the two sets of stairs as Walthers suggests, one for each platform, I suggest cutting a rectangular slit through each platform and roof, and glue a section of the stairs into
