I think you should do concrete bed for electric rails and gravel ballast for unpowered. And looking good! Think you might make a total 32bpp graphics thing or are you just content with roads and stations at the minute?
I'd like to have some thins change based on rail type, like platform details, but I think it would be best for the trackbed to remain somewhat consistent to whether the station is indoor or outdoor. There are a lot of ideas I have for things I'd like to do - 32bpp is not central organizing theme, but I find modelling and rendering more amenable than pixel art personallly. I don't have any plan to do a baseset, but eventually it may be possible to cobble bit together between different things I make if I ever finish any of them.
My main goal with stations for now is to create something that could be an ogfx+ station set. My goals with houses are more along the lines of studying and celebrating certain architectural paradigms, so progress only seems to happen there when something really inspires me.
On the topic of OGFX stations, the second 'type' to model is the monorail station. The goal would be that this style of station building would be available for all rail types, from around the 1960s onward. The main feature of the ogfx 8bpp monorail train shed is a catenary suspended glass ceiling, so I've been toying with different real and potential roof technologies in that style. These types of roofs first stated to appear at a large scale in the early 60s, as did the first concrete beam monorails, so it seemed spiritually fitting to aim for a late-middle 20th century style. Most of what I've modeled so far is creeping towards archigram though....
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So far I am mocking up the roof surfaces as simple membranes, but I do not yet know whether they will be tensile roof membranes (high technology fabrics) or some kind of suspended glass panel system, nor what portion will be covered or opened. Most of these shapes are for a 2x2 tile area, but I feel this type of structure looks better spanning longer distances - 4-5 tiles. The columns are just placeholders for now, and most cables will become even thicker to show up better. In the lower left you can see some space frame elements I am working with for a later spaceframe roof - I may scale these down to have catenary shaped spaceframe members instead of cables, but they turn into noise at small sizes at ottd scale.