{|class="wikitable" style="width: 498px; height: 171px;" |- ! scope="col" | Text ! scope="col" | Result |- | '''n'''orth | Trains moving from south to north are blocked |- | '''s'''outh | Trains moving from north to south are blocked |- | '''e'''ast | Trains moving from west to east are blocked |- | '''w'''est | Trains moving from east to west are blocked |- | '''l'''eft | Trains moving from left to right (relative to the sign) are blocked |- | '''r'''ight | Trains moving from right to left (relative to the sign) are blocked |- | '''b'''ackwards | Trains moving from the back to the front (relative to the sign) are blocked |- | '''f'''orwards | Same result as if you keep the line empty |- |}