I went to Bletchley Park recently, and they have a single room full of these where they would intercept codes from the Germans, write them down, file them away, someone else would come in, triage the 100s of new messages, take the most promising in a van and drive it off for it to get decoded.
An endless operation, apparently cars were constantly coming and going just to decode these messages











I have a friend who says words to the same!