LTK Engineering Services, founded in 1921, is one of the largest rail transportation consulting firms in the United States. The company serves local, regional, state and federal public agencies. It has regional offices in Boston, Chicago, Dallas, Denver, New York, Los Angeles and Seattle. LTK Engineering Services offers customized design, inspection, rail car and component testing, warranty administration and accident repair services. The company has assisted in the procurement, construction and refurbishment of more than 10,000 passenger rail vehicles. It provides planning services that include feasibility studies, estimation of capital and operating cost and quality control procedures. LTK Engineering Services maintains a location in Portland, Ore.