The power for the layout is located in a pull out drawer. In the drawer is the 10 amp power supply, fuse block, voltage and current meters, Digitrax Zephyr command station, a track booster and an accessory booster. 
In the previous configuration the power supply was set for 17.5 volts and powered both boosters and the Zephyr. The boosters were 5 amp NCE PB105 units with built in voltage regulators. The Zephyr also has a built in regulator, thus the need for 17.5 volts.
The accessory booster has just been replaced with a Team Digital DCCBoost unit. It does not have a built in regulator so the power supply voltage was reduced to 13.6 volts. The Zephyr is now powered by its own 13.5 VDC power supply. The NCE PB105 is powered by the internal transformer of the power supply.
There are 10 Team Digital DCCBreak circuit breakers which are located on two different panels.