You are Gus Gamelton. A member of Elevator Maintenance Team at Black Mesa Research Facilty. You work here for a very long time and alredy saw things. You heard that today a very important person visits BMRF but it's none of your business and today will be just another day, isn't it?
Make the rail brushes bit higher. If you're worried about a step effect you could vertex the edges down towards the main ground brush to make it look smooth.
This screenshot was taken during the earlier stage of development. This map will have brush rails just like on the other screenshots.