"The railroad sign, often abbreviated to RR sign, is a tool introduced in Chip's Challenge 2. It allows Chip, Melinda, mirror Chip, mirror Melinda, or a rover to cross railroad tracks as if they were floor."@en . "The railroad sign, often abbreviated to RR sign, is a tool introduced in Chip's Challenge 2. It allows Chip, Melinda, mirror Chip, mirror Melinda, or a rover to cross railroad tracks as if they were floor."@en . . . "No"@en . "No"@en . "Railroad sign"@en .