harrow
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As I've found with one of the loco's I look after, sometimes straight draining down doesn't work, I now take a couple of pipe off.
And it's not just copper, to give an idea of how much damage water freezing can do, a couple of years back was looking at an old tubular steel frame which had been left outside, in a several areas it had swollen up (started as rectangular box section) and a couple of the tubes had split, and that was 2.5mm thick steel.
A similar example how ice can damage concrete if there is a crack or gap in it, the same idea as it causes pot holes in the roads.