Here are three stocks with buy rank and strong momentum characteristics for investors to consider today, October 21st:Arch Resources, Inc. ARCH: This producer and seller of thermal and metallurgical coal has a Zacks Rank #1 (Strong Buy) and witnessed the Zacks Consensus Estimate for its current year earnings increasing 56.4% over the last 60 days.Arch Resources Inc. Price and Consensus Arch Resources Inc. price-consensus-chart | Arch Resources Inc. QuoteArch Resources’ shares gained 18% over the last one month compared with the S&P 500’s gain of 3.1%. The company possesses a Momentum Score of B.Arch Resources Inc. Price Arch Resources Inc. price | Arch Resources Inc. QuoteComstock Resources, Inc. CRK: This independent energy company has a Zacks Rank #1 and witnessed the Zacks Consensus Estimate for its current year earnings increasing 15.5% over the last 60 days.Comstock Resources, Inc. Price and Consensus Comstock Resources, Inc. price-consensus-chart | Comstock Resources, Inc. QuoteComstock’s shares gained 6.7% over the last one month. The company possesses a Momentum Score of A.Comstock Resources, Inc. Price Comstock Resources, Inc. price | Comstock Resources, Inc. QuoteEmbraer S.A. ERJ: This designer, developer, and manufacturer of aircrafts and systems has a Zacks Rank #1 and witnessed the Zacks Consensus Estimate for its current year earnings increasing 39.3% over the last 60 days.Embraer S.A. Price and Consensus EmbraerEmpresa Brasileira de Aeronautica price-consensus-chart | EmbraerEmpresa Brasileira de Aeronautica QuoteEmbraer’s shares gained 6.8% over the last one month. The company possesses a Momentum Score of A.Embraer S.A. Price EmbraerEmpresa Brasileira de Aeronautica price | EmbraerEmpresa Brasileira de Aeronautica QuoteSee the full list of top ranked stocks hereLearn more about the Momentum score and how it is calculated here. 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 7 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 EmbraerEmpresa Brasileira de Aeronautica (ERJ): Free Stock Analysis Report Comstock Resources, Inc. (CRK): Free Stock Analysis Report Arch Resources Inc. (ARCH): Free Stock Analysis Report To read this article on Zacks.com click here.