I believe you're stretching the use of that small pack. It can power a single engine. If you're powering the track thru the TIU, you could/should get more power. Most everyone on this forum runs AC packs with their 3 rail trains in O scale. I believe the HO side of this forum will continue to grow.
If you got the small MTH DC wall wort from Ray's site, here's a description of it's designed use:
The ZDC24 is a small wall outlet DC power supply designed to plug into the M.T.H. DCS Remote Commander for users looking to utilize the DCS Remote Commander on HO DC model railroads or into the M.T.H. TIU auxiliary power port for those looking to power up the TIU electronics.
The CSA-approved power supply plugs into any standard AC wall outlet. The barrel jack connector snuggly plugs into the DCS Remote Commander receiver and outputs 16 constant voltage DC volts to the track.
