2007-02-13 14:30:37 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Weather
Where I come from, it's because it doesn't snow.
Otherwise, I guess it's because they are always raised slightly from the surrounding ground, so that it tends to get blown into drifts on either side of the rail?
The track may also be protected by fences either side, so that snow drifts against them instead of continuing over the track.
I presume that sometimes it does accumulate, and it has to be plowed off.
2007-02-13 14:36:29 · answer #1 · answered by Anonymous · 0⤊ 0⤋
That's probably only true when the air temperature is above freezing. The rails are thermally conductive, so if the air temperature is above 0ºC, the exposed vertical parts of the rail are directly exposed to the air and convective heating of the rails keeps the rails from getting down to freezing.
2007-02-13 14:35:22 · answer #2 · answered by arbiter007 6 · 0⤊ 0⤋
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2007-02-13 14:55:03 · answer #3 · answered by did h 1 · 0⤊ 0⤋