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!