I decided to add captions to my YouTube video for FMCaltrain. It was pretty easy. I logged into YouTube, selected My Videos, and then found the video and selected Insight -> Captions and Subtitles. From there, I found a machine generated caption file (really just a text file with time codes). I downloaded the caption file and edited it to correct some voice recognition mistakes. After that I re-uploaded it to YouTube and now my video is accessible to people who need captions. Check it out at http://youtu.be/gIk6BgKofHk.