Paul Catapano asks:
Is there any correlation between the position of the hatches (open orPaul,
The short answer is no. Open hatches mean loads in ventilator service,
while closed hatches mean either loads with ice, or an empty car.
Interestingly, a given load might have it hatches open for a period and
closed for another, depending on weather conditions and the need to
maintain the correct temperature for the load. There are some great
accounts of this in the PFE book (Thompson, Church and Jones).