SketchUp Tutorial - Creating Curved Track Segments

I'm using SketchUp to create models for games. Currently I'm working on railroad track segments for RollerCoaster Tycoon 3. I've made track segments before but they were quite easy to texture. Now this is not the case with my current project as the trackbed is slanted.

I wonder what's the fastest and easiest way to create curves. Not only perfectly round curves but also s-shaped curves and other ones where the radius is different at every point.

This is what I tried:

• The follow me tool leaves it untextured.
• The Shape Bender plugin doesn't map the textures.
• The Fredo Scale's Radial Bending in combination with the UV Toolkit only works for curves with a static radius.
• The Perpendicular Tools (using a cross section of the model) needs manual UV mapping as well.