Stan,
How are you connecting the power feeds from the TIU to the track? RealTrax Lock-on?
RealTrax is designed so that the Lock-on determines which outside rail is the Common(neutral return of AC) by it's orientation.
The plan on page 14 has the lock-ons oriented to the outermost rail being the common for sidings and isolated part of the loop and the main part of the loop has the innermost outside rail connected.
The outermost outside rails are isolated just past the thru and turnout of the switches. to create a block. Sidings(Blocks) A & B are controlled by switching the common with a SPDT switch and the Mainline has constant power. (see attached snip)
Now let's discuss operation. When you have a variable channel on the TIU, why do you want to use the controller handle for conventional train operation? The remote will do that by addressing the variable channel.
MTH recommends using the adapter cables and connecting the Z-1000 brick directly to the TIU. This is because the hot and common of the jack coming out of the brick are reversed. the controller or the adapter cable corrects this. They also recommend to not power the TIU via the MTH controller.
The wiring for this is attached from the MTH DCS manual-p13 . (attached)Connect the leads to Variable 1 and a jumper (hot wire only)to fixed 1 to power the TIU.
Then insert the Variable 1 TIU out terminals in place of the transformer in the layout wiring diagram.
You dial up the voltage for dcs trains and leave it. For conventional trains, you dial up the power as you would use a handle.
Your are going to need for new curves if you clipped off both connectors near the switches.
Next the WIU is added and you operate trains via your portable devices.
