Never heard it in my life:o.
Meh! im not looking forward to getting one of these i struggled to get my mouse working on this laptop. Be prepared for a "I cant get my soundcard to work" post very soon.RV look forward to laughing at me again;)

Yeah, "jump on the ____ train" is an expression. It's like you're joining the train of people who have a certain thing. Another word for that is "bandwagon". :P
That didn't start out on the internet, it's pretty much a real life expression.