The Digi-Power-Box
If you are planning to build a very large layout with more than 4-6 locos running at the same time, many switches operating and other electrical units are likely to be working as well, you need a capable power supply.
The "PIKO Digi-Power-Box" offers this power and many more features.
The "PIKO Digi-Power-Box" is the state-of-the-art of the PIKO digital system. We call it PPB.
You can control a great number of diverse operations with it!
Have a look at the following features (which are not the only ones):
-Two independent throttles for locomotives
-Maximum number of controllable locos: 9.999
-Up to 2.000 switches and signals can be operated
-Up to 48 different track routes can be programmed and connected in series
-Up to 128 speed steps
-12 different functions can be controlled: lights, signals, sound etc.
-Up to 4 locos can be lined up for multi-traction
-Switches off automatically in case of short circuit
-Bus system that can be expanded by "Loconet". You can use additional electrical units with "Loconet", such as throttles, control desks for locomotives and other electrical accessories (lights, sound, signals), the Uhlenbrock "Lissy-System" for loco-identification and automatic system control, and much more…
-Computer connection via the serial interface (ComPort)
-DCC booster connection
-interface for the tracks to program locomotive decoder
-Built-in receiver for the PIKO "Digi Fern" and connection for additional remote control receivers
-Virtual loco addresses
-Multi-lingual menu
-Compatible with NMRA-DCC
-The software can be updated


Source -
http://piko.de/produkt_db/check.php?page=digipowerbox&grand_id=10