Hi,
I’m afraid, that at present RailClone doesn't allow automatically combining the geometry on multiple splines to create intersections, crossroads, t-junctions, on-ramps, off-ramps, etc. This is something that has been requested often, and it's on our wish list, but because RailClone is not a specialized road-making tool it must be compatible with any generic mesh using multiple rules so implementing this feature would be very complex. We´ll see what can be done in future releases.
Let me mention, that for some of these scenarios, you might find the way
described in this post helpful.
Best regards,