<> V40

Standard Ventilation at "--" Degrees (Other than 32 Degrees)

<> VC

Vents Closed to Destination

<> VD40

Diagonal Ventilation at "--" Degrees (Other than 32 Degrees) - Open Vent Each End of Car

<> VDOI

Diagonal Vents on Irons

<> VO

Vents Open to Destination

<> VOI

Vents on Irons

<> VS

Standard Ventilation at 32 Degrees

<> 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)