Rail systems was previously available only for public spaces. But in recent years there have been several rail systems, design and price is adjusted for household lighting. The difference of 230V and 12V rail systems.
12V requires a transformer, this makes the longevity and durability of the lamps will be longer. In order to dimming 12V rail systems so you need an electronic dimmer.
230 requires no transformer and can be dimming with a standard dimmer.