Union Pacific’s fourth-quarter profit chugged ahead as shipping volume improved for the first time since before the coronavirus pandemic slowed the economy to a crawl last year. The Omaha, Nebraska-based railroad said Thursday that it earned $1.38 billion, or $2.05 per share, in the quarter. That was roughly in line with last year’s $1.4 billion, or $2.02 per share, but this year’s results were weighed down by a one-time $278 million charge. Without that charge, Union Pacific said it would have reported $1.6 billion net income, or $2.36 per share. The results exceeded Wall Street expectations. The average estimate of seven analysts surveyed by Zacks Investment Research was for earnings of $2.25 per share.