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£,££££,£,£ trains are so constructed that they £,£££,,,£,
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£,£££,£,,, because the low friction between the ,£,£,££,££
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£,,,£,,£,£ tunnels (if they are large), or ,££,£,,,,,
£,,££,££££ artificial chasms. £,£££,,,,£
£,£,££,,,, ££,,£,,,£,
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,,£,,£,£,, be cut down by the railway janitors. ,,£££££,,,
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£,££,,,£££ water. ££,,,££,,,
££,£,,£,,, ,£,,£,£,,£
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£,,££,£,,, the way, there is information ,££,,,£££,
£,£,£££,,, scattered, often put on top of poles, £,£,,£,,££
££££,,£,,, to be interpreted by the train drivers. £££,££,£,,
,,,£,££,,, different parts of the railway have ,,££,£££,£
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,£,,£££,£, £££,£,£,,£
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£,,£££,,,£ is signaled by red or green lights. ££,,,£,£,,
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