Timber frame construction was still dominant during the late 1840s arrival of the railroad in Vermont. Railroad companies erected large, timber trestles at their crossings. Shortcomings in timber frame bridges came to light during the advent of the railroad. The bridges could not hold up to the weight of the locomotives, and many collapsed. By the late 1880s, railroad companies turned to iron truss bridges as a safer and sounder alternative to the flimsy trestles.