track of ballast chippings
Explanation:
Of course, with my railway background, I'd have to offer something like this, wouldn't I?
But joking apart, ballast tracks are what the railways use when towing derailed vehicles back onto the tracks, when they have left them far behind. The point is that while ballast tracks are stable, gravel tracks are not - the pebbles slip against one another too easily, while this is not possible with the edges and corners and rough surfaces in a ballast underlay.
|  David Moore
Local time: 11:00
Specializes in field
Native speaker of:  English
PRO pts in category: 705
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The translation workplace 
peer agreement (net): +3