id	definition
VC	Vents Closed to Destination
VO	Vents Open to Destination
VS	Standard Ventilation at 32 Degrees
V40	Standard Ventilation at "--" Degrees (Other than 32 Degrees)
VOI	Vents on Irons
VD40	Diagonal Ventilation at "--" Degrees (Other than 32 Degrees) - Open Vent Each End of Car
VDOI	Diagonal Vents on Irons
VS10	Standard Ventilation - Substitute Carrier's Protective Service at First Terminal Train Yard where Heaters Are Available and Outside Temperature is 10 Degrees Above Zero or Lower (PPT #619 Rules 385 and 515)