Starting in 1923 the Northern Pacific ordered more than 4,000 double-sheathed cars in the 10000-13999 series. This large group shared many common features, including steel ends with lumber doors, radial roofs and lever handbrakes. Amazingly, these cars lasted in revenue service until 1970 and in company service for another 12 years. Because of their large number they could be found on freight trains across North America. Features include full underframe detail with riveted center sill, AB or K brakes as appropriate and formed wire grab irons installed at the factory.