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Fixing uneven track

Showing how to fix an uneven piece of track. No matter what you lay your track on, due to damp, temperature change, loco movement, and time, it can always move slightly. 1mm in OO gauge is the same as 3 inches in real life. The eye would struggle to detect 1mm of movement but sadly many locos do not. 2mm is 6 inches in real life, imagine what a 6 inch drop in track would do to a real locomotive. I have edited this as watching me pack ballast under a railway sleeper even for the most committed is boring. This video also shows the advantage of using screws to secure your track.