Earlier this year Hitachi confirmed a factory in County Durham would build rolling stock for high-speed trains.

BBC: Siemens Desiro train

While Rolls-Royce hawks its wares around the world, Bombardier's facilities (across Europe and North America, as well as in Derby) have depended on single contracts to build local rolling stock.

ECONOMIST: Manufacturing: A tale of two industries | The

Also, once you get the fear snowball rolling, it does have a tendency to build on itself.

NPR: Steep Drop in Global Stock Markets Monday