Any special geometry on the main tracks must be able to accommodate 50 cars with ease. NMRA clearances should be adhered to, but height limits can set to accommodate catenary at 18 to 23 feet above the rail. Track will be held back from the end of the module by 2.5 following NTrak standards. The first 1.5 of track on each module must be flat and straight. Any number of crossings and switches can be used on the main.
Sidings have no limits.
Minimum radius on the main is 6 while non-main tracks can be tighter. Catenary Specifics oNeCAT catenary follows NCat standards. All frogs on the main should be manufactured to allow both pole and pantograph operation. I have found that some HO frogs will provide suitable operation of N scale shoes. Catenary at the module ends should be terminated with a 00-90 brass washer approximately one half inch from the end of the module.