...Norfolk Southern Corp.'s credit metrics should remain relatively consistent despite increased share repurchases.In the first nine months of 2019, Norfolk Southern repurchased $1.6 billion of its shares. Although lower than the $2.3 billion it repurchased in the prior-year period, the company is still devoting a significant portion of its cash flows--as well as incremental debt--to fund shareholder rewards. Nevertheless, its credit metrics have remained relatively consistent because of its increased earnings and strong cash flow, and we expect such trends to continue. The company's free cash flow benefited from the tax reform enacted in December 2017, under which its tax rate declined to 23% in 2018 compared with 36% previously. In addition, we expect earnings to benefit from its precision scheduled railroading (PSR) initiative....