It looks like Caltrain has started blocking the script that I was using to generate the rss feed of the Caltrain news. (It looks like the blocking started to happen about a week after someone from Samtrans started subscribing to the feed)
It also doesn't appear that they are planning on creating their own feed. This seems pretty short sighted, as this is a pretty useful way to disseminate their information.
So if you are subscribed to this feed, I don't know how reliable it will be. (I will try and keep it up as long as possible.)