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 | | This can be done witha single track used by trains in both directions; on rail lines like these, "crossovers", "passing loops" or "passing sidings", which consist of short stretches of double track, are provided along the line to allow trains to pass each other, and travel in opposite directions. |
 | | In Britain, vandalism is thought responsible for about half of rail accidents.Railroad lines are zoned or divided into blocks guarded by combinations of block signals, operating rules, and automatic-control devices so that at most one train may be in a block at any time. |
 | | Annual death rates on roads are over 40,000 in the United States and about 3000 in Britain, compared with a thousand passenger fatalities on railways in the United States and under 20 in Britain. |
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