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!