I agree with phage and ohiotim2112 - aircraft contrail.
You can see a strobe at one point when the camera operator zooms in.
Trains or trails left by objects entering or exiting our atmosphere usually become very distorted,
very quickly, since they are punching
through multiple layers of atmosphere where the crosswinds in each layer usually travel in completely different directions... the result is very
characteristic, and looks nothing like the later part of the footage in question, which shows a relatively un-twisted contrail IMO.
Examples of rocket contrails/ballistic missile launches can be found in
elevenaugust's thread here, and I posted a couple of examples of the
trains created by natural meteoroids entering the atmosphere
here.
edit on 20-12-2011 by C.H.U.D. because:
clarification