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HRS

HAZ CARGO RAIL SECURITY SURCHARGE

HS

Harmonized commodity description and coding system

HSS

HIGH SECURITY SEALING

Humping

The process of connecting a moving rail car with a motionless rail car within a rail classification yard in order to make up a train. The cars move by gravity from an incline or “hump” onto the appropriate track

HWS

HIGH WATER SURCHARGE

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