Question 13 Which of the following is not an advantage of a diesel-electric railroad locomotive over a coal-fired steam locomotive? O diesel is internal combustion and steam is external combustion O engine crew sizes are smaller O diesel engines cause much less air pollution O all of these are advantages O diesel fuel contains more energy per weight or volume than coal O wheel slip can be minimized by computer controlling the electric motors Question 14 Safety regulation of the intercity rail mode in the US is handled by: O FRA O AAR O ICC O US Supreme Court O STB