The PTC represented by its New York lawyers mobilized technical arguments in response. Electrical engineers provided witnesses and testimonials. These people were also in the business of streetcars.
These experts argued that the lines did not pose any threat to human life.
They claimed that the horse-cars made more noise than the electric streetcars.
They discredited the alternatives saying that they were unreliable and costly. Saying that the success of Budapest was just an anomaly.
They attacked their opponents as enemies of progress.
They wanted to portray themselves as the allies of working class. Alleging that the protesters were well-heeled people and small shopkeepers who have gotten a little wealth and protest against everything.