Mealey's (February 4, 2019, 12:05 PM EST) -- CHICAGO — A railroad conductor lost his bid to hold his employer responsible for an elbow injury when the Seventh Circuit U.S. Court of Appeals on Feb. 1 affirmed dismissal of his federal claims based on the proper exclusion of his causation expert, who contradicted himself in deposition and affidavit testimony (Jeffery A. Kopplin v. Wisconsin Central Limited, No. 17-3602, 7th Cir., 2019 U.S. App. LEXIS 3315)....