new plan

Here is a picture showing two sets of two switches against each other near the bottom of the layout and the trains have no problems operating thru them.  The pair to the left are both operated with one push button switch per direction as the have no need to not operate as pair.   As for as S curves, try it as it will probably work.  Some switches may have trouble with the switch solenoid covers interfering with each other.  My Marx switches have a small foot print.

Charlie

Here is my crossover made from 4 k-line 072 switches, no issues there.

Here is my sidings with back to back k-line 042 switches, no problems here either.

YMMV

It really depends on what you are running and how good your track laying is. I don't run big scale steamers.

thank you Darrell and Charlie good to know I will be using either Gargraves or ross 072 switches. gives me more options thanks again

Part of the answer to your question depends on the equipment you will be running.  If you will only be running "non-scale" or shorter scale equipment, then O72 (or smaller) switches can be used for crossovers and sidings.  Just remember to watch your track separation on curves if running parallel tracks.  However, if you will be running "scale" or longer "non-scale" equipment, you would be better served to use numbered (#4, #6, #7.5) switches as they make for smoother transitions.  Even then, some practical uses can be found for O72 switches.

Chuck

I have a pair of 042's back to back. I run smaller equipment and have no problems.

All of the "O.." switches have a curved diverging track, the # switches are straight. All depends on what you are running and the space available.

Bob

thanks Chuck and Bob appreciate your input. will have to think about this