Transactions of the American Society of Civil Engineers vol. LXVIII Sept. 1910

Jacobs discusses the logistical difficulties involved in the tunnel’s design and execution particularly in overcoming the geological constraints of the riverbeds and urban infrastructure. One notable innovation highlighted includes the use of hydraulic shields which were essential for safely tunneling through varying and unstable subterranean conditions. The analysis provides a technical breakdown of the construction methodologies including the choice of materials and strategic design adjustments. The report serves as a valuable case study on early 20th-century civil engineering projects and their role in urban and transportation expansion. The volume also delves into the historical context tracing key figures like financier Mr. Corbin and engineer W. H. Baldwin Jr. whose efforts influenced the shift from bridge-based solutions to the tunnel system. The strategic emphasis on cost-efficiency modern engineering tools and practicality in urban planning further distinguishes this case study from other infrastructure projects of the time. The report remains a significant contribution to civil engineering literature offering insights into one of the most important urban rail developments of that era