Each distribution block has eight power outlets. You can connect two distribution blocks together and power them with one Walthers power supply for up to 16 turnouts.
I installed one on the Wisconsin & Southern East Troy Branch, which you can read about in the September issue, or see video of on MRVP.
Eric
WALTHERS CONTROL SYSTEM Switch Machine Reference Guide - Part 3 - Connecting Power 942 - 101
"3.1 Distribution Block and Power Supply
The 942-110 Filtered DC Power Supply is designed to connect directly to the 942-111 Power Distribution Block and provide 12 VDC power for up to 16 switch machines. If the full capacity is not used for switch machine power, other layout devices may also connect to the power distribution block pin connectors or terminal strip."
RR Baron
How many switch machines can you hook up with the power block on this system?