Pasadena via Oak Knoll was a line of the Pacific Electric Railway running from 1906 until 1950 between Downtown Los Angeles and Downtown Pasadena California with additional service to Altadena during rush hour.The route was originally built in 1906 to reach the Wentworth Hotel (later Huntington Hotel) in Oak Knoll. It was the second to last PE line to be decommissioned in Pasadena and was the last line to run along Colorado Boulevard.[1]