Introduction: As the TrainingFinder Real-time Affiliate Integrated Network (TRAIN) commemorates its 21st anniversary, it's worth taking a closer look at the remarkable journey of this invaluable platform. It was created in response to the urgent need for comprehensive training for first responders and public health professionals following the devastating attacks on September 11, 2001. SinceThe post TRAIN at 21: A Partnership between The Public Health Foundation and KMI Learning appeared first on KMI Learning.