 It seems that the structure of a main unit in Taibai County, with smaller replica units throughout the Bases, is repeated in the transportation units.Warhead and missile transport in China is heavily reliant on the rail and road systems, likely why a large-scale rail project was constructed in the 1960s by the PLA in the area of Baoji, a large city in Shaanxi province and the location of Base 67's headquarters since that same time period.This became a concern after the 2008 Sichuan earthquake, where the vulnerability of transport networks in Shaanxi province was dramatically proven.