NEILLSVILLE, Wis. (AP) – Clark County authorities say an 81-year-old man was killed when his minivan collided with a freight train.        The sheriff’s office says an initial investigation found Charles Podbelsek of Spencer did not stop at the stop sign at a crossing and struck a Canadian National train.  Podbelsek was thrown from the van and died at the scene.  The crash was reported about 9:15 a.m. Tuesday in the Township of Unity.