The 504 King is a streetcar route operated by the Toronto Transit Commission in Toronto, Ontario, Canada. It was grouped together with the 508 Lake Shore for accounting purposes until the latter was cancelled on June 19, 2015 and has since been replaced by the new 514 Cherry streetcar line which launched one year later. In 2005-06, these routes carried 47,900 passengers on an average weekday (of which the vast majority were carried by 504 King), making 504 King the busiest TTC streetcar route in terms of number of passengers. As of September 6, 2015, this route operates 24 hours a day seven days a week. During weekday rush hours, daytime and early evenings, average service frequency is 4 minutes or less. Saturday daytime services have an average frequency of 4–5 minutes with Sunday daytime