Steam fever spreads. Even the engines making up Iowa Interstate’s CBBI (Council Bluffs, Iowa to Blue Island, IL) are puttin’ it out as Big Boy fever spreads. IAIS 601 (GP38, ex-Missouri Pacific) and 650 (yard slug) are seen passing the former Rock Island Depot in Council Bluffs, IA, now home to the Rails West Railroad Museum on the afternoon of Monday, May 1, 2019.