Splitting the blades. CSXT Z491, also known as Indiana Rail Road's HWLV (Hiawatha Yard to Louisville), splits one of over a dozen sets of active semaphores on CSX's former Monon Hoosier Sub. If you couldn't guess, INRD 6007 and 6011 are former SOO SD60s, while HLCX 5994 is obviously a former UP SD60.