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£,£,£,££,, have to follow a set path. this  path is £,£,££,,£,
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£,£,£,££,, of two metal rails, hence its  nickname. £,£,££,,£,
£,£,£,,£,£                                          £,£,,£,££,
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£,£,£,,£,£ wheels of  the train and the rail metal, £,£,,£,££,
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£,£,£,,£,£ can  be, and  even more so for how  much £,£,,£,££,
£,£,£,££,, the  ground  under  the  rails   can  be £,£,££,,£,
£,£,£,,£,£ sloped. thus a railway is  often not led £,£,,£,££,
£,£,£,££,, on top of  hills, rather through them in £,£,££,,£,
£,£,£,,£,£ tunnels   (if   they  are   large),   or £,£,,£,££,
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£,£,£,,£,£                                          £,£,,£,££,
£,£,£,££,, there  will be trees on  the side of the £,£,££,,£,
£,£,£,,£,£ rails, but not too close,  or  they will £,£,,£,££,
£,£,£,££,, be cut  down  by  the  railway janitors. £,£,££,,£,
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£,£,£,££,,                  water.                  £,£,££,,£,
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£,£,£,,£,£ to be interpreted by  the train drivers. £,£,,£,££,
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£,£,£,,£,£         different speed limits.          £,£,,£,££,
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£,£,£,,£,£ sometimes, trains have  to stop and wait £,£,,£,££,
£,£,£,££,, for something  to happen, far away. this £,£,££,,£,
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