... screenshot showing how at significant curving, there is no reverse curve for stock traversing the crossover road. This is a B-8 crossover in 00-SF: 2_270246_040000000.png You can see that in this case there is no reverse curve anywhere in this formation, all curving is in the same direction. The diverging turnout radius for the inner turnout is showing negative, i.e. it is curving in the same direction as the main road. To see that more clearly I have added a straight red line on this template print: 2_270251_030000000.png With no reverse curve you can safely use any type of V-crossing for such a crossover. Here I used generic V-crossings. That lengthens the turnouts, making an easier radius in the outer turnout. For a smaller shunting layout, or in goods yards etc. where bogie passenger vehicles won't be running, usually you want the crossover to be as short as possible, and reverse-curve effects may not matter so much. Generally it is then better not to use the REA switches, but change to ...