Investors might want to bet on Schneider National (SNDR), as earnings estimates for this company have been showing solid improvement lately. The stock has already gained solid short-term price momentum, and this trend might continue with its still improving earnings outlook.Analysts' growing optimism on the earnings prospects of this trucking company is driving estimates higher, which should get reflected in its stock price. After all, empirical research shows a strong correlation between trends in earnings estimate revisions and near-term stock price movements. Our stock rating tool -- the Zacks Rank -- has this insight at its core.The five-grade Zacks Rank system, which ranges from a Zacks Rank #1 (Strong Buy) to a Zacks Rank #5 (Strong Sell), has an impressive externally-audited track record of outperformance, with Zacks #1 Ranked stocks generating an average annual return of +25% since 2008.Consensus earnings estimates for the next quarter and full year have moved considerably higher for Schneider National, as there has been strong agreement among the covering analysts in raising estimates.Current-Quarter Estimate RevisionsThe company is expected to earn $0.52 per share for the current quarter, which represents a year-over-year change of +67.74%.Over the last 30 days, the Zacks Consensus Estimate for Schneider National has increased 6.45% because seven estimates have moved higher compared to no negative revisions.Current-Year Estimate RevisionsFor the full year, the earnings estimate of $2.50 per share represents a change of +9.17% from the year-ago number.In terms of estimate revisions, the trend for the current year also appears quite encouraging for Schneider National. Over the past month, 10 estimates have moved higher compared to no negative revisions, helping the consensus estimate increase 6.02%.Favorable Zacks RankThe promising estimate revisions have helped Schneider National earn a Zacks Rank #2 (Buy). The Zacks Rank is a tried-and-tested rating tool that helps investors effectively harness the power of earnings estimate revisions and make the right investment decision. You can see the complete list of today's Zacks #1 Rank (Strong Buy) stocks here.Our research shows that stocks with Zacks Rank #1 (Strong Buy) and 2 (Buy) significantly outperform the S&P 500.Bottom LineWhile strong estimate revisions for Schneider National have attracted decent investments and pushed the stock 6.1% higher over the past four weeks, further upside may still be left in the stock. So, you may consider adding it to your portfolio right away. Infrastructure Stock Boom to Sweep America A massive push to rebuild the crumbling U.S. infrastructure will soon be underway. It’s bipartisan, urgent, and inevitable. Trillions will be spent. Fortunes will be made. The only question is “Will you get into the right stocks early when their growth potential is greatest?” Zacks has released a Special Report to help you do just that, and today it’s free. Discover 5 special companies that look to gain the most from construction and repair to roads, bridges, and buildings, plus cargo hauling and energy transformation on an almost unimaginable scale.Download FREE: How to Profit from Trillions on Spending for Infrastructure >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Schneider National, Inc. (SNDR): Free Stock Analysis Report To read this article on Zacks.com click here.