When I run my "leap frog," I engage a set of diodes and in-rush suppressors to slow the trains in those specific sections. It's basically a "1-step" slow down, but quite effective.
If not engaged, the trains may run too far such that they may rub as they pass when the other train is released.
The caveat is that if you run lighted coaches, your train may speed up and slow down as each coach bridges the span to the main line letting the full voltage through.
You an see it in operation here: