I blogged previously about our experience riding the maglev train in Shanghai. At the time I wasn't able to post the video I had taken because I didn't have a fast internet connection. I finally got around to doing it last night. The original video is here. If that doesn't work for you I also put up a copy on YouTube, but the quality suffered a lot.
Towards the end of the clip we encounter the train on the opposing track. It gives new meaning to the aphorism "don't blink or you'll miss it".