The classic American school bus - yellow, loud and trailing diesel exhaust - may soon get an electric upgrade.Each weekday morning, buses running on nothing but battery packs shuttle students to schools in northern Sacramento and the neighboring suburbs. The vehicles - made by Lion Bus of Quebec, Trans Tech Bus of New York state and Motiv Power Systems of Hayward - are cleaner and quieter than their diesel-burning brethren. Since they spend most of the day idle, recharging isn't a problem.Read full news