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This is safe? Only one spike instead of what obviously calls for two, at least 20mm above the track flange. This is a most heavily used track. What prevents the rail from tipping over when a heavy train travels on them?
Update April 26:
Barbra's comment (below) prompted me to have a quick look at European rail construction. I did a quick search on the internet. Here's what I found almost immediately:
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They use concrete ties (no wood) and bolt their tracks to them. I see no "play" between the bolted brackets and the rail. This looks like a seldom used spur line (consider the rust on the top of the rail). The Europeans appear to secure even their little-used tracks in this fashion.