I tried to create a method of joining code 100 to code 83 before that didn't work out very well but after watching a video on the subject this time it works. I just changed a few things in the video. The video says file down the code 100 track until just a small portion is left. Then he says to join the 2 tracks with a code 100 rail joiner. I tried that; it didn't work out very well. What I did was file down the code 100 until a small portion is left then file off the bottom flange off the code 83 track. I then used the new standard Atlas rail joiner for code 100 or code 83. It fit almost perfectly. The video says not to solder but I soldered the two. I would have to say it worked out perfectly.