Main tracktypes (-) are not connectable to each other. Each one is a seperate system.
Sub tracktypes (v) are connectable to each other. Sub tracktypes usually define max speed of vehicles driving over it. Only one subtracktype can be selected at one time/tile.
Extra features (x) are things which can be added to the subtracktype, or not. Several can be added at one time/tile.
(comments use //)
- Narrow Gauge // I don't think Steel Sleepers would be necessary. Speed is limited anyways at NG, right?
v Wooden Sleepers
v Concrete Sleepers
x Catenary
x Cogwheel
x Third Rail
- Standard Gauge
v Wooden Sleepers
v Concrete Sleepers
v Steel Sleepers
x Catenary
x Cogwheel // Dunno if this is necessary
x Thirdrail
- Monorail // Couldn't really make up much subtracktypes and extra features
v Low Quality // Low max-speed
v High Quality // High max-speed
x Magnetic Levitation // Monorails can both use wheels and maglev, right?
- Maglev // Couldn't really make up much for this one too
v Standard MagLev // TT-alike
v Vacuum Tube // Standard track in a tube sucked with vacuum so there's no friction at all. Futuristic and expensive
- Road
v Sand
v Cobblestone
v Concrete
v Asphalt
x Crash Barrier // For safety? Prevents accidents?
x Street Lights // Same thing. Perhaps also increases popularity of bus lines?
x Catenary // Trolley-busses and trams
x Tram Track // Not all trams need catenary, right?
- Highway/Motorway
v Concrete
v Asphalt
v Open Asphalt Concrete // What Dutch peeps call "ZOAB", dunno the English word
x Crash Barrier
x Street Lights
x Hard Shoulder // Perhaps to prevent accidents when a vehicle brakes down?
- Canals // Couldn't really make up much for this one too
v Shallow
v Deep
x Safety Buoys
- Cable Lift // Would be nice for a mountainous landscape with small cities, I think
v Cable // Only one system, since you can't have half a good cable and half a bad cable on one lift
Please discuss
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EDIT: POLL ADDED: Read Purno's 4th post for more information. Poll runs for 5 days!