 Shares of Kansas City Southern KSU, 0.62 slumped 1.1 in premarket trading Tuesday, after the railroad operator reported third-quarter profit that fell short of expectations, as auto plant shutdowns resulting semiconductor shortages, service interruptions from right-of-way blockages and increased regulation of shipments into Mexico led to a 3 decline in carload volumes. Net income fell to 156.1 million, or 1.71 a share, from 189.7 million, or 1.01 a share, in the year-ago period. 