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!