No special DSS switches beat the practicality, simplicity and reliability of two regular 3 rail turnouts. One just needs the space.
3 rail DSS and double crossovers can be a challenge.
When you are talking about a # 4 switch, remember it is only a #4. A rather sharp angle for larger wheelbase engines, even with blind drivers and non rigid frame style engines uniquely articulated.
Generally speaking a #6 switch will safely handle most all large engines.
One of the most frequent obstacles I encountered when I would first meet to quote a job was a modeler who had collected a quantity of large engines and scale 80' cars for use in a limited space.
Equipment and scale need to take into consideration the space available.