What is "trunk feeder transportation"?

Trunk feeder transportation is mainly bulk transfer between DCs, bulk transportation between DCs and stations, and even reverse transportation; Because the logistics modes of various e-commerce companies are different, sometimes the transportation link of procurement logistics is also included (regarding the integration of procurement logistics, here is a case: in mid-21, JD.COM tried a mode: the business of supplying hundreds (now there may be more than 1,, the details are unknown) of suppliers to JD.COM DC is centralized outsourced to several professional logistics companies, and the logistics companies directly sign transportation agreements with suppliers. It is not the weakness of e-commerce that DC/ factories of suppliers directly deliver DC/feeder transportation to Beijing, Shanghai and Wuhan nationwide according to JD.COM's instructions. Pure personal opinion: low entry threshold and fierce competition are naked price wars and speed wars. If the logistics industry is judged to be "deep and shallow", this field is a deep water area. From the aspects of driver management, vehicle maintenance, other cost control, route design, supply organization, etc., most of them are in a semi-dark state, and there are many blind spots. At present, the mainstream operating model is still resource-intensive, capital-intensive, labor-intensive ... knowledge and technology are absent.