most Airslides were in Captive service,RRs didn't like to waste
time and funds cleaning them as they weren't the easiest cars
to clean.
so Sugar cars would stay in Sugar service unless the shipper
stopped shipping by rail,moved,or closed down.
Airslides were rarely used in Grain service,but were used in Flour
service,Chemical service,powdered Plastic service,and other fine
material service,some for their whole lives.
Spikre