I use a BUSS on my 15x33 DCS layout. I use suitcase connectors at the BUSS and solder the leads to the rails. The one thing I didn't do that I should have was to block the track sections for each drop. I still could, but I'm lazy. The furthest section of the layout from the TIU sometimes gets a double horn/whistle.
OGR's own Alan Arnold showed me how.
Have Fun!
Ron