It is a pain. I am working on a large fictional layout now with an electrified line. I am using a catenary spline and keeping the tracks straight and level as much as possible since that is easier. Like cascaderailroad said, using the height tool is important. I also use a catenary height tool <kuid:41462:23996> to get the wires centered over the tracks. The problem is that the catenary splines don't react to the straighten tool, meaning that curves need to be done point by point at regular enough intervals. It can be done, of course, but you need the patience. As JCitron mentioned, there are some insanely detailed kits but they take a lot of time, so I guess it all depends on your level of patience and what compromises you can live with. I also do a lot of trial and error by running a loco with the pantographs up and noting where the wires are too high of low so I can go back and try to adjust them. Unfortunately, many locos in Surveyor default to the pantos being down, so you have to go into Driver to see the results. There are some payware European engines where you can set the pantos to raised in Surveyor. Good luck!
