The Collaborative International Dictionary of English v.0.48:

Expressage \Ex*press"age\ ([e^]ks*pr[e^]s"[asl]j; 48), n.
   The charge for carrying a parcel by express.
   [1913 Webster]

WordNet (r) 3.0 (2006):

expressage
    n 1: rapid transport of goods [syn: express, expressage]