Dallas; yes the Z4K will work fine for your 2 loop setup. Each handle feeds one Fixed output, each to one loop, with multiple track feeds depending on your loop size. Insulate the center rail at the crossover points of your end to end switches. Set both handles for 17-18 volts (assuming you are running command) and your transitions will be smooth and simple.
I use all 4 TIU outputs, with the variable channels set to fixed so they simulate command voltage outputs. My track is separated into quite a few blocks, each switched, with an average of about 100 ft of track per TIU channel, so as to get the best DCS signal strength I can. But you should be fine with the 2 fixed channels.
Rod
