Federal Signal (NYSE:FSS - Get Free Report) released its quarterly earnings results on Thursday. The conglomerate reported $1.34 earnings per share for the quarter, beating the consensus estimate of $1.32 by $0.02. The firm had revenue of $655.50 million for the quarter, compared to analysts' expectations of $661.61 million. Federal Signal had a return on equity of 21.36% and a net margin of 11.66%. The company's revenue was up 18.1% compared to…