Elsewhere I posted my 072 tubular track layout with 711 switches. Tubular track is the least realistic but its reliability and durability still generates a lot of fans. In addition to ties and ballast, I painted the rails including the black phantom center rail and you'd be surprised how good it can look.
Still, there can be derailments, especially entering curves from switches with big freight haulers. Easily rectified with guard rails, and Plastruct I beams are a great solution. Actually they can work with any 0 track. For tubular 0, use 3/8" beams. Cut the top of the I off and file it smooth, gently bend (if necessary) to the contour of the rail, and super glue to the metal ties. The base of the I beam snuggles up to the rail clip. Of course they will have to be painted.