Atlas O 21st Century Track and MTH Dual stall engine house.

You have to modify the entrance area of the base under the doorway to accommodate the profile of the roadbed or ties of the track that you are using.

Pieces of hardboard or Masonite or cork roadbed can be used to raise the track inside.

Work the base edge with a file, knife, grinder, whatever you have on hand to fit it to the track.

You can also trim the track ties to fit, if you would like to keep the shed original. Just cut them with a hobby saw or cutting disk.

yes, you may have to remove the tabs. I think they were specifically for Lionel FasTrack accommodation.

Thank you for the fast reply. Was wondering about those little adapters. Will take them off as suggested and place a piece of Masonite under the track and see if it works. Thank You again.

IF anyone wants an MTH dual enginehouse that has it's floors modified already, contact me. My e-mail is in my profile.

I have the dual shed and use Atlas track.  I had no issues lining up the track and putting the shed over the track.  I didn't make any mods to the shed.  As for the approach, I used Atlas O72 switches, and a section of O72 track to go parallel and they lined right up.

As for track height, I have my track on the Midwest cork road bed and the top of the rail lines up with the floor of the shed.  Just be sure to screw the shed down using the two holes in the shed floor between the track.

Thank You everyone for the answers and the photos. I removed the fasttrack adapters and raised the track and it looks great. Placing it about 16" coming off the Millhouse 34" turntable and will use Atlas Flex  to bring track through shed off turn table.