Peco electrofrog crossing & reverse module

You only really need to have 8 insulating joiners if you have a block section after the crossing that you wish to monitor with some sort of feedback system. You will then need to feed power to the outer rails of the crossing too. Otherwise use insulated joiners only on the frogs as the outer rails never change polarity.

You could use the same reversing unit if you can guarantee that you will not have a loco on one crossing and another loco on the other crossing. If there is a chance of the two crossing being used at the same time, use two reversing units.

BTW, I have found in the past that Peco insulfrog crossings work well on DCC, obviously without the need for any reversing unit. They don't foul up little 0-4-0 locos as much as insulfrog points do as with a crossing you tend to be going faster than at a set of insulfrog points.

You can use changeover switches instead and if the crossing is part of a crossing with access controlled by a pair of points as shown in the diagram below, you can use the same switches as for the point frogs. If you stare at the diagram for long enough you will see that you wire the frogs in a pair along one rail. So in the diagram you have the green pair and the magenta pair which you see in the bottom left most image. The black lines indicate the selected route through the crossing.

You might wonder if you would have a point on both ends, but I believe Board of Trade (?) regulations would require you to protect both ends from a run away, so the end you were considering leaving "point less" should have a trap point at the least and that will accept a motor which could drive the second switch.

David