In July, R.J. Corman Railroad Group executive Michael J. Donfris is expected to become the new chief financial officer of transportation manufacturing corporation Greenbrier Companies, the Lake Oswego, Oregon-based company announced May 21. Donfris is expected to start as senior vice president of finance for Greenbrier before officially becoming CFO and principal financial officer in July when the company files its Form 10-Q for the fiscal quarter that ends on May 31, according to Greenbrier. Donfris, who was chosen following a national search, had served as CFO since 2020 for R.J. Corman, a Kentucky-based firm that operates short line railroads…