 With the construction of the road between Cumberland, Maryland and Wheeling, West Virginia (then in the state of Virginia).Fink supervised much of the design, and oversaw the building of some of the first iron bridges in the nation, including that over the Monongahela River in Fairmont, West Virginia.It was this bridge that first implemented his design of the Fink truss, and was in fact in its time the longest iron railroad bridge.