I found that once you get the UNH webcam URL in use in your address bar, you can change cameras by modifying the Camera Id to be 1, 3, or 4. I haven't found other id's that work yet.
Camera 1 looks at a building under construction.
Camera 2 doesn't appear to be online.
Camera 3 and 4 show the tracks from either side. You can have two browser sessions going with both cameras and catch both sides of the train.
These are the fastest webcams I've seen so far.