PHILADELPHIA — Watch for sleek new power on lines in and around the City of Brotherly Love as the Southeastern Pennsylvania Transportation Authority begins testing their first copy of Siemens' ACS-64 electric locomotive. Railfans spotted SEPTA No. 901 at the intersection of Easton and Susquehanna Roads in Roslyn, Pa., on Feb. 10 during a round-trip to Warminster, Pa., on the agency's north-south Warminster Regional Rail line. SEPTA is expected to purchase 15 locomotives that will upgrade service and replace 7 AEM-7 and 1 ALP-44 locomotives.