In recent years, underground systems have become an essential part of modern urban infrastructure due to the growth of the population and size of cities and the increasing demand for efficient, sustainable and reliable transportation solutions. The advantages related to the use of subways are numerous, and the most important are the ability to alleviate traffic congestion, the enhancement to job opportunities and services connecting the city center with the neighborhoods and the possibility to have an easy transportation access that leads to a more inclusive system. The aim of the work is the design and realization of support jigs to produce parts of subway cars that will enter service on the Washington DC subway in 2027.