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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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£,,£,£,£,£ sloped. thus a railway is often  not led £,££,£,££,
£,££,£,£,£ on  top of hills, rather through them in £,,£,£,,£,
£,,£,£,£,£ tunnels   (if   they  are   large),   or £,££,£,££,
£,££,£,£,£            artificial chasms.            £,,£,£,,£,
£,,£,£,£,£                                          £,££,£,££,
£,££,£,£,£ 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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£,££,£,£,£ scattered,  often put on  top  of poles, £,,£,£,,£,
£,,£,£,£,£ to be interpreted by the train  drivers. £,££,£,££,
£,££,£,£,£ different  parts  of  the  railway  have £,,£,£,,£,
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£,££,£,£,£ for something to happen,  far away. this £,,£,£,,£,
£,,£,£,£,£ is  signaled  by  red or  green  lights. £,££,£,££,
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