Each K83 has red and brown sockets (Pair on each side). Connect these to track power. They do not draw much power unless you are throwing a switch, and then only one is active at a time.

5211 has the same (4) Red and brown sockets, connect these the same as k83. 5211 also has extra Red socket (with red dot *). You can connect this to seperate red (or yellow) wire if you wish. I just jumper this to other Red sockets.

5211 and k83 use so little power that it may not be worth the bother to assign each k83/5211 to specific booster/traffo.

Hope this helps.

Like Lars above, I also recommend to separate the accessory decoders from track power. When a solenoid throws, it can draw as much as 700mA. If you have several trains running at the same time, and they are in the same circuit, behind one 32VA trafo, the switching may become unreliable. A simplified wiring diagram for separate track and accessory circuits can be found from my web-site:

http://personal.inet.fi/...kinen/Power%20Scheme.gif