The pedestal-style position light signal was designed for the Pennsylvania Railroad in the Thirties. This signal was first used in an installation where the PRR wanted to convey normal- and medium-speed indications, but where space was too tight to use a full size position light signal. PRR's dwarf signals conveyed only slow speed indications, so for movement from a siding onto a main line, a train would be held to 15 mph until it was all on the main. With a pedestal signal such as this, a train leaving the siding can be given a Medium Clear, allowing movement at 30 mph. Though this type of signal is common in the northeast, it is rare in the midwest – and even rarer on ex-NYC lines! The Marion Secondary was resignaled during the Conrail era using position light signals salvaged from elsewhere on the system.