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!