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!