Is it possible to use 2 or 3 digit addresses in the ez command?
E-Z Command Dynamis – yes
E-Z Command Control Center – no
The E-Z Command Control Center supports 1 through 9 digital addresses. To use address 10 as a digital address see the Setup and Programming Instructions (http://www.bachmanntrains.com/home-usa/images/E-Z_Command_instructions.pdf).
can the 2 units be tied together?
I have the ez command unit and the dynamix operates 2.5 amps if combined will it operate 3-4 engines?
No.
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Only one DCC command station to a layout no matter the size of the layout. Connecting multiple units operating as DCC command station will damage them.