I have a few hundred feet of fastrack, with power to the center rail every 10-15 ft. My fastrack is not screwed down, it sits on carpet underpad.
local power issues have been fixed by bending the track pins slightly to increase friction and thus better electrical contact. (I bend the all pins to ensure good contact). The other solution was to add wood shims under parts of the layout where the track was bending, resulting in a loss of track power. Between these two solutions, I was able to resolve all my track power and signal strength problems.
