I've only got a small N-Scale (Code 80) door layout with maybe 35' of track. So I'm not too worried about rail expansion. Regardless, I soldered every single joint, and I've run feeders to every block as well as on either side of every (non power-routing) turnout. Basically, I don't have any more than 3 feet of track without feeders. So in addition to having plenty of evenly distributed power, this layout is indestructable! The problem with unsoldered joints over time is the buildup of crud in between the joints where you can't get to.