Costain Group PLC provides infrastructure solutions for the energy, water, transportation, and defense markets in the United Kingdom and Spain. It operates in two segments, Transportation and Natural Resources. The Transportation segment operates in the highways, rail, and aviation markets. The Natural Resources segment engages in the water, energy, and defense markets. The company's services include strategic consultancy, consultancy and advisory, digital technology solutions, asset optimization, and complex program delivery services. Costain Group PLC was founded in 1865 and is headquartered in Maidenhead, the United Kingdom.