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!