Hay Street is a major road through the CBD of Perth, Western Australia. The street was named after Robert William Hay, the Permanent Under Secretary for Colonies. Sections of the road were called Howick Street and Twiss Street until 1897.[1] Orientated east-west, the road starts at the Causeway traveling west through the suburbs of East Perth, Perth, West Perth, and Subiaco, where the road originally terminated at Subiaco. A subway under the Fremantle railway line was constructed in the early 1900s, replaced when the railway was moved underground through Subiaco in 1999. From that point it becomes Underwood Avenue through Jolimont, Floreat (past Perry Lakes) and ends in Swanbourne.