Experts say the colony was probably there for several years and took more than 12 hours to remove.
It is the first time an overseas military force has been granted the Freedom of Huntingdon.
Poor accountability was to blame for severe rail disruption last May, a regulator has said.
Steve Moir was on his way home from work at nearby Cambridge Assessment when the crash happened.
Sometimes working out where you can go green with your rubbish just needs a little bit of help.
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