context: During that year, Tesla worked in Pittsburgh, helping to create an alternating current system to power the city's streetcars. He found the time there frustrating because of conflicts between him and the other Westinghouse engineers over how best to implement AC power. Between them, they settled on a 60-cycle AC current system Tesla proposed (to match the working frequency of Tesla's motor), although they soon found that, since Tesla's induction motor could only run at a constant speed, it would not work for street cars. They ended up using a DC traction motor instead.
question: పిట్స్బర్గ్లో టెస్లా ఏ. సి. సిస్టమ్ను ఉపయోగించారు?
answers: to power the city's streetcars. the city's streetcars street cars