rails                   
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 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, 
 there  are limits for how acute a  curve 
 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 
            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. 
 there  will  be  plains, and  bodies  of 
                  water.                  
                                          
 trains  go  by day  and by  night. along 
       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 
         different speed limits.          
                                          
 sometimes, trains have to stop and  wait 
 for  something to happen, far away. this 
 is  signaled  by  red  or  green lights. 
                                          
                                  
                                          
 many people  follow the  rails by  foot. 
 often  this  proves to  be  the  shorter 
 path  between two points.  however  this 
 is  frowned  upon,  and  very   impolite 
         toward the train drivers!