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!