Having some fun trying to incorporate Youtube train audio into clips of the rr. This was done with software I downloaded
titled Blaze Media Pro here http://www.blazemp.com/. Lets you lay over any audio though it takes a little work to match up the time of the audio with vid. You get a 15 day free trial.
The video used for the clip is here http://www.youtube.com/watch?v=nywc5oVmXE8 . Whats cool are all of the atmospheric sounds that come with a passing train. All of the creaks and groans....not sure how this could be done with current sound systems.....interesting though....