^~^%%&####                                          ####&%%^~^
,^^^^^^%&#                                          #&%^^^^^^,
,^~^%%&&&&                                          &&&&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^%%&&##                                          ##&&%%^~^,
,^~^%%%%%&                  R41LS                   &%%%%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^^%%&## &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& ##&%%^^~^,
,^~^%%&###                                          ###&%%^~^,
,,,,^~~%%# &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& #%%~~^,,,,
,^~^%%&&##                                          ##&&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,,^^^~~%%# TR41NS  4R3  SO  CONSTRUCT3D  TH4T  TH3Y #%%~~^^^,,
,,,,,~^%## H4V3 TO FOLLOW 4 S3T P4TH.  TH1S P4TH 1S ##%^~,,,,,
,,,^^^^%&# C4LL3D 4  "R41LWAY",  WH1CH 1S COMPR1S3D #&%^^^^,,,
,,^^^^^%%& OF TWO M3T4L  R41LS, H3NCE 1TS N1CKN4M3. &%%^^^^^,,
,^~^%%%%&#                                          #&%%%%^~^,
,^~^%%&### B3C4USE  TH3  LOW  FR1CTION  B3TWEEN TH3 ###&%%^~^,
,,,^~^%%&# WH3ELS OF TH3  TR41N 4ND TH3 R41L M3T4L, #&%%^~^,,,
,^~^%%&### TH3RE 4R3  L1MITS FOR  HOW 4CUT3 4 CURV3 ###&%%^~^,
,^~^%%&### C4N  B3, 4ND  3VEN MOR3 SO FOR HOW  MUCH ###&%%^~^,
,,,,^~%&&# TH3  GROUND   UND3R  TH3  R41LS  C4N  B3 #&&%~^,,,,
,^~~~%%%%& SLOP3D. THUS 4 R41LWAY 1S OFT3N  NOT L3D &%%%%~~~^,
,^~^%%&### ON TOP  OF H1LLS, R4TH3R THROUGH TH3M 1N ###&%%^~^,
^~^%%&#### TUNN3LS   (1F   TH3Y   4R3  L4RG3),   OR ####&%%^~^
,,,^^^^%&&            4RT1FICIAL CH4SMS.            &&%^^^^,,,
,^~^%%&###                                          ###&%%^~^,
,^~^%%%&&# TH3RE W1LL B3  TR3ES ON  TH3 S1D3 OF TH3 #&&%%%^~^,
,^~^%%&### R41LS, BUT NOT TOO CLOS3, OR  TH3Y  W1LL ###&%%^~^,
,^~^%%&### B3  CUT  DOWN BY TH3  R41LWAY  J4N1TORS. ###&%%^~^,
,,,^~%%&&# TH3RE  W1LL  B3  PL41NS,  4ND  BOD13S OF #&&%%~^,,,
,^~^%%&###                  W4T3R.                  ###&%%^~^,
,^~^%&####                                          ####&%^~^,
,^~^%&#### TR41NS GO BY  D4Y  4ND BY  N1GHT.  4LONG ####&%^~^,
,,,,^^^%%#       TH3 W4Y, TH3RE 1S 1NFORM4TION      #%%^^^,,,,
,^~^%%&### SC4TT3RED,  OFT3N  PUT ON TOP OF  POL3S, ###&%%^~^,
,^~^%&#### TO B3 1NT3RPRETED  BY TH3 TR41N DR1V3RS. ####&%^~^,
,^~^%%&### D1FF3RENT  P4RTS  OF  TH3  R41LWAY  H4V3 ###&%%^~^,
,^~^%%&###          D1FF3RENT SP3ED L1MITS.         ###&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^%%%%%# SOM3T1MES, TR41NS  H4V3 TO STOP 4ND W41T #%%%%%^~^,
,^~^%%&### FOR SOM3TH1NG TO  H4PP3N, F4R 4WAY. TH1S ###&%%^~^,
,^~^%%&### 1S  S1GN4L3D  BY  R3D OR  GR3EN  L1GHTS. ###&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^%%&###                 &&&&&&&&                 ###&%%^~^,
,^~^%%&###                                          ###&%%^~^,
,^~^%%&### M4NY P3OPLE FOLLOW TH3  R41LS  BY  FOOT. ###&%%^~^,
,^~^%%&### OFT3N  TH1S  PROV3S  TO  B3  TH3 SHORT3R ###&%%^~^,
,^~^%%&### P4TH  B3TWEEN TWO PO1NTS.  HOW3VER  TH1S ###&%%^~^,
,^~^%%%%## 1S  FROWN3D   UPON,  4ND  V3RY  1MPOLIT3 ##%%%%^~^,
,^~^%%&###        TOW4RD TH3 TR41N DR1V3RS!         ###&%%^~^,
,,,,^~~~%&                                          &%~~~^,,,,
,^~^%%&###                                          ###&%%^~^,
,,,^~~^%%#                                          #%%^~~^,,,
,^~^%%&###                                          ###&%%^~^,
,^~^^^%%&#                                          #&%%^^^~^,
,^~^%%&###                                          ###&%%^~^,