i'm sorry!
i made a layout to help describe the whole block wireing thing.
you see the green rail? thats the common rail. you only need to connect one feeder to it.
the red rail is the outer rail. you determine where each block would be, and divide it. in this case, each block is insulated and divided at the big black squares on the red rail. the black circles indicate where feeders would go, but you can put a feeder anywhere on the block. you can use plastic rail joiners, or you can use a razor saw, and cut the rail where the end of a block is desired, and fill it in with a nonconductive material to keep the rails from touching each other. do not divide the common or green rail.
these feeders are then connected to the top terminals of an atlas controller, in this diagram with blue wires. the last three on the second controller isn't needed, and can be left alone. on the side of a controller there will be two terminals. the top on for CAB A (one throttle) and the bottom one for CAB B ( the second train's throttle). connect the right hand DC track power terminal from each throttle to the appropriate CAB terminal. in this case, the red throttle is CAB A, so its connected to the top terminal of the controller with a red wire. The orange throttle is CAB B, so it is connected to the bottom terminal of the controller with a orange wire.
now back to the common rail. put a feeder where ever convenient on the green rail (inner rail), and connect it to both throttles on their left hand DC track terminal.
the layout should now be block wired. when you slide one of the green switches on the controller up, the track connected to that switch will be controlled by CAB A. slide it to the bottom, that section of track is controlled by CAB B. the middle turns that section of track off.
you now should be able to run 2 trains at once, just keep an eye on them. short circuits can happen if they run into a clock where the direction is switched in the opposite direction, but this won't be a problem if you pay attention.
i hope this helps
chris
(ps sorry for all the gramatical errors in my first post)
Elite Juice Jack Modeler.