** Shares of railroad operator Union Pacific UNP.N rise 1.2% to $228.60 in premarket trade after Susquehanna upgrades stock rating to "positive" from "neutral"
** "We view UNP's share price underperformance as an opportunity vs. a better-than-feared volume backdrop for rails" - brokerage
** Says UNP's volumes remain healthy and its network is fluid
** Also trims rating on peer CSX CSX.O to "neutral" from "positive"; shares marginally down premarket
** As of last close, S&P 500 Rail Transportation sub-index .SPLRCRAIL up 1.56% YTD
(Reporting by Anshuman Tripathy)
((Anshuman.Tripathy@thomsonreuters.com))
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