We are hoping to stop at Mauthausen concentration camp on our way to Melk. I can't find many options of transportation to make this happen, other than the train with a connection to a regional train. We will have luggage. Can anyone recommend a private transfer company or day trip originating from Salzburg? We would like to leave early, stop at the camp then take the train in time to visit the Abby in Melk before it closes.