Multiple rigrail with camera blend - waiting for camera blends

Hey guys I’ve been having lots of trouble trying to figure out a way to blend camera from rigrail to another. When i was blending those cameras using function “change camera with blend” i get strange effect - like my camera is trying to catch rigrail and accelerates unnaturaly. Is there anyway to get information when change camera with blend is ended ? (Delay makes weird cutscrean effect)