Here is one way to do it without cutting down a piece of track. Use the the Fastrack to tubular track adapter. This gives you a nice square end to start with. Cut the road bed right where it starts to angle down on both sides approximately 3/4" back. Using cork roadbed you can bring the Fastrack up to the same height as the Atlas track. Secure the Fastrack with #4 x 1" screws and you are ready to go.