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¨¨¨¨£¨¨¨¨¨ scattered,  often put on top  of  poles, ¨££¨¨¨¨£¨¨
¨¨¨¨¨£¨¨¨¨ to be interpreted  by the train drivers. ¨£££¨¨¨¨£¨
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¨¨£¨¨¨¨¨¨£ sometimes,  trains have to stop and wait ¨¨¨¨¨£££¨¨
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