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!