Lake Street analyst Robert Brown views Harsco's Q2 results and "excellent" and reiterates a Buy rating on the shares with a $31 price target. The Street is underappreciating the company's margin expansion opportunity and free cash flow potential, Brown tells investors in a post-earnings research note. He believes the Harsco's Q2 results were the strongest in at least five year as the company is seeing the results from its turnaround efforts and benefiting from a recovery in the industrial and rail end markets. The analyst now has increased confidence that Harsco can reach 13% operating margin at its long-term goal of $2B in revenue.