You observe a small charge separation between the ends of a conducting rod that is lying on the table in front of you. This is puzzling because the rod is not connected to a battery or other power source; it is at rest on the nonconducting table, pointed toward a nearby window. You call your friend, who calmly asks where you are. You reply that you are riding the high-speed train between Paris and Avignon. Your friend offers explanations for the charge separation in two different inertial reference frames. What are those explanations?