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!