Hi,
I model in Nscale and following are my method which is easy and give good result so it’s suitable for HO.
For my turnout I usualy first paint them whith an airbrush but I protect the points whith a “Post It” paper which allow me to paint all the surrounding parts.
The points are handpainted whith a brush, but again I avoid to put paint on the inside of the switch point.
This could be not a problem if you use live frog whith live points like a good DCC friendly turnout because the point are electricaly connected to the adjacent rail but I prefer to protect the points.
You can also paint the rail a rust color and add some black around the moving parts of the turnouts to represent grease.
About the uncoupler I try to use permanent magnet only on industrial spurs.
On the mainline, for siding, or in the yard I use only electromagnet uncoupler to avoid false uncoupling.
I homemade them myself, following an small sketch published in MR years ago, you can believe how easy they are to do. See some pics below.
In a yard, all the ladder track have three, one in the east entry one in the middle of the track and one at the west entry of the ladder track. I left a two inch space between the turnout and the uncoupler.
This arrangement give more prototypical move of the trains which are put on the ladder track and left by the engines. This avoid movements before the ladder track to uncouple. The middle uncoupler is used for more cutting possibilities in the consist.
Here is the basis of the uncoupler, a steel tube whith a half quarter removed and the two plastic plate, lenght is 4cm for a Nscale. opening is an around 9 millimeters, tube is around 15mm diameter
[IMG]http://i260.photobucket.c