On both sides of the Longhai-Lanxin line, an industrial zone (along the Longhai-Lanxin line) has been formed, which includes Xuzhou (coal) industry, Zhengzhou (textile) industry, Xi'an (aircraft and color picture tube manufacturing) industry, etc.
In addition, there are Luoyang (machinery manufacturing) industry, Lanzhou (petrochemical and machinery) industry, and so on.
In addition, there are Luoyang (machinery manufacturing) industry, Lanzhou (petrochemical and machinery) industry
.