Remarshal

Five marshalling yards in the vicinity—Pontypool Road, Rogerstone, Alexandra Dock Junction, East Usk Junction and Severn Tunnel Junction—remarshal much of this traffic into full train loads to destination.

Source: wiktionary

The BRB proposes to allow itself more elbow-room to re-marshal trains to meet varying day-to-day demands; on a train conveying mixed standard and first-class accommodation, the proportions of each may be variable if there is a higher demand for one category of seating on some days of the week. or at certain seasons - for example the period of the London Motor Show, when there is a big call on first class accommodation to the capital.

Source: wiktionary