Of a train or coach: travelling away from the capital or principal terminus; of or relating to such trains or coaches.

Of trains or coaches: Going or running up; up-going. (See up, adv.1 6d.)

That descends, drops, or falls downwards; that comes onwards.

In collocations arising from an ellipse of the noun after up. Of or pertaining to ‘up’ and ‘down’ trains.

Railways. Designating or relating to a railway system consisting of a train of coal hoppers running perpetually on a circular route between…