Lehigh Valley No. 81 named Ant, is a type of 2-10-0 "Decapod" type steam locomotive. It was built by the Norris Locomotive Works in 1867 for the Lehigh Valley Railroad.
The ANT was rebuilt in 1880 as a 4-8-0 at Weatherly, was still around in 1905 to become ten-wheeler number 90, and was finally scrapped in 1912.