I'm still new to the ins and outs of route building. Some of the routes in TS19 use the Tb enbankment spline with track laid on top of it. I really like the look of it and want to know how to replicate it. What tips can be provided to do this efficiently and with relative ease? Also, is there a "trick/hack" to lay this enbankment spline under existing track on a route? Thanks in advance.