Rail lighting system is similar to a low-voltage track lighting that you get a movable directional head and mini pendants to choose from and could be either a duo-rail or monorail lighting system.  There is a similarity between a cable lighting and duo-rail lighting system in that you attach your head and mini pendants between two conductors running suspended across your ceiling but in this case your two conductors are rails and not cables.  In a mono-rail lighting system your heads or mini pendants are attached to a single rail and running suspended across to your ceiling.  Rail lighting system usually used halogen bulbs.  Some of this lighting system has corner attachments while others can be pre-bent at a time of manufacture or it may depends on the rail you have selected and some can be curved on the site with the aid of bending tools or even by hand for creation of custom layout to suit your applications and aesthetic requirements.  You can achieve accent, task, ambient and even decorating effects depending on your selection and application of your heads and mini-pendants.  Rail lighting system is often used in kitchen and home offices although it can be used in any rooms in the house.  Rail lighting system has become very popular these days and there are so many brands and types to choose from.