The subway hub is a neutral tech structure which when captured, grants control of all Subway Entrances in the area to the owner. All subway entrances can then be used by that player. It appears in Tiberium Wars and Kane's Wrath.
Subway hubs are often found in major cities - at least in cities where they are not consumed by Tiberium. One subway hub can be found in the Washington DC mission where your attacking Nod forces can capture it and strike GDI at different parts of the city. Another subway hub can be utilised by GDI in the counterattack to drive the Scrin forces in Berne out of New Eden. Another is situated in the middle of a skirmish map, with its entrances leading out to the open areas.
The Subway Hub has a network of underground tunnels that is similar to the Global Liberation Army's own Tunnel Networks from Generals. However, unlike the tunnel networks, the subway hub cannot be constructed nor is it armed.