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£,£,£,££,, have to follow a set path.  this path is £,,£,£,£,,
£,£,£,,£,£ called a "railway",  which is  comprised £,££,£,£,£
£,£,£,££,, of two  metal rails, hence its nickname. £,,£,£,£,,
£,£,£,,£,£                                          £,££,£,£,£
£,£,£,££,, because  the low  friction  between  the £,,£,£,£,,
£,£,£,,£,£ wheels of the train and  the rail metal, £,££,£,£,£
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£,£,£,,£,£ can be, and even more  so  for how  much £,££,£,£,£
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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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£,£,£,,£,£       the way, there is information      £,££,£,£,£
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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 £,,£,£,£,,
£,£,£,,£,£ is  signaled by  red  or  green  lights. £,££,£,£,£
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