###...#.##                                          ###.#.#..#
###..##..#                                          ###.#.#.#.
.##.#.#.##                                          .##.#.#.#.
#.#.#.#..#                                          ..#.#.#.#.
#.#.#.#.##                                          .##.#.#.#.
#.#.#.#..#                  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!        ..#.#.#.#.
#.#.#.#.##                                          .##.#.#.#.
#.#.#.#..#                                          ..#.#.#.#.
#.#.#.#.##                                          .##.#.#.#.
#.#.#.#..#                                          ..#.#.#.#.
#.#.#.#.##                                          .##.#.#.#.
#.#.#.#..#                                          ..#.#.#.#.