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THIS CACHE IS NOT HIDDEN AT PUBLISHED COORDINATES!
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To find this cache, please complete Adventure lab SideTracked - Southend Train Stations first.
After each stage you will be getting a set of Bonus numbers. When You have collected everything needed, then cache can be found at
N 51° 32.ABC' E 0° 42.DEC'
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I do wonder, does these trains use a green energy... 