Union Pacific and BNSF Railway, two of the largest Class 1 rail services in the United States, said they are working diligently to relieve rail congestion and mitigate delays that have been brought on by extreme weather conditions, global supply chain disruptions and worker shortages.

Industry officials testified be­fore the federal Surface Transportation Board (STB) in April and said they are taking the necessary steps to meet STB’s new reporting requirements to address service issues.

Union Pacific's Robynn Tysver, communications manager, said over the last few weeks the...