鉄四局参加設計工作的技术人員为了面向工农兵。适应大打“人民战爭”修建鈇路的需要 ,會采取了一系列措施,創制了許多模型,挂图及二腊底图。通过实踐,証明这些办法是有效的,深受工农兵欢迎。現将鉄四局生产指揮組送来“关于制作桥涵模型挂图和涵洞二腊底图的情况介紹”全文刊登,幷将挂图五张摘要縮印,附在本文內以便参考。图上技术名辞是编者加注的。至于涵洞二腊底图,限于幅,未能刊登介紹,如读者需要,可逕向四局索取。 The technicians of the fourth bureau to participate in the design work were to face the workers, peasants and soldiers. In response to the need to build a “people’s war” to build a road, it will adopt a series of measures to create a number of models, wall charts and maps. Through practice, it has been proved that these methods are effective and welcomed by the workers, peasants and soldiers. The production command group of the Fourth Bureau of the Fourth People’s Armed Forces sent the full text of the “Introduction to the Making of Bridge and Culvert Model Wallcharts and Culverts to the Second Base Map”. The five abstracts of the wall charts were printed at a glance and are attached here for reference. The technical name on the map is annotated by the editor. As for the map of culverts on the bottom of the second culvert, it was limited to the size and could not be published. If readers needed it, they could ask for it in four rounds.