After Herman Lombaert completed his civil engineering studies, he took a job with the P&T under engineer Samuel H. Kneass (1806-1858), with whom he helped build the main line. In 1836, Kneass and Lombaert helped survey the prospective route of the Philadelphia, Wilmington, and Baltimore Railroad (PW&B)
from the Delaware state line to its initial Philadelphia terminus at the intersection of Broad Street and Moyamensing Avenue.[5] Lombaert was the target bearer, while Kneass' younger brother Strickland Kneass was the chain carrier.[6] The line became the first rail link from Philadelphia to Baltimore (and survives today as part of Amtrak's Northeast Corridor).
In 1838, Charles Lombaert was one of three superintendents of construction for the PW&B.[7] Herman, the son, had moved up from his job on the surveying team to the post of assistant engineer, under Samuel Kneass, for the Philadelphia-Wilmington stretch. And in the meantime, Kneass had become not just Herman's boss but his brother-in-law: on March 14, 1837, Kneass married Herman's sister Anna (1814-1869) in Morrisville, Pennsylvania.[8]
Herman Lombaert's work on the PW&B was noted (along with that of his father and brother-in-law) on the 1839 Newkirk Viaduct Monument in Philadelphia.
In 1851, Herman Lombaert became assistant superintendent of the PRR, under Herman Haupt.[9] The following year, he became the railroad's superintendent.
In 1853, a young Andrew Carnegie was working for Thomas A. Scott, then the superintendent of the PRR's Pittsburgh division (and later PRR president). Lombaert, who was Scott's boss, invited the 18-year-old Carnegie for tea. In his autobiography, Carnegie described Lombaert as "the great man in our railroad field...not sociable, but stern and unbending." (He found Sarah Lombaert "exceedingly kind.")[10]
In 1862, he became a vice president of the PRR.[1][12]
In 1871, he became president of the American Steamship Company of Philadelphia, a shipping company launched with PRR investment, and the following year resigned from the railroad.
^"1832 (June 2004 Edition)"(PDF). PRR CHRONOLOGY. The Pennsylvania Railroad Technical & Historical Society. June 2004. Archived from the original on 12 June 2014. Retrieved 23 August 2013.
^"1836 (June 2004 Edition)"(PDF). PRR CHRONOLOGY. The Pennsylvania Railroad Technical & Historical Society. June 2004. Archived(PDF) from the original on 4 October 2013. Retrieved 23 August 2013.
^"1851 (March 2005 Edition)"(PDF). PRR CHRONOLOGY. The Pennsylvania Railroad Technical & Historical Society. March 2005. Archived(PDF) from the original on 14 October 2013. Retrieved 23 August 2013.
^Skillman, David Bishop (1932). The Biography of a College: Being the History of the First Century of the Life of Lafayette College. Easton, Pennsylvania: Lafayette College.
^"1834 (June 2004 Edition)"(PDF). PRR CHRONOLOGY. The Pennsylvania Railroad Technical & Historical Society. June 2004. Archived(PDF) from the original on 14 October 2013. Retrieved 23 August 2013.