TRRR,
The 90° cross looks ok electrically. All of the rails around the center block are connected. The jumper is there to provide the option to isolate the pieces of the cross if there are two different power districts crossing one another. The jumper should be there for the configuration that you are using.
One caution, move the jumper so that it doesn't lay across the common contacts to avoid chafing the wire and having a short.
A 3 axle truck on a small radius track looks like a tight fit. The collector frame or roller may be slightly touching the outside rail at the point where the engine stops on the 031 curve.
If it is only the case of the roller dropping off of the center and not touching the outside while the front is on the insulating cross block, then the curve is still too small for this engine.
What is the part number for SD70 engine?
