In 1942, the company became Gunderson Bros. Engineering Corporation. After World War II, the company had comprehensive facilities for large-scale metal engineering, as well as a slipway for launching ships at the Front Avenue plant, and the earlier Linnton plant was closed. Construction of marine vessels such as tugs, barges, trawlers and more specialised craft continued in the 1950s and 1960s, and by the 1970s the company was building vessels as long as and as wide as . Other postwar business lines included metal water towers, large-scale metal storage tanks, bridges and structural steel for buildings, as well as specialised equipment such as metal slipways for the McNary Dam (1950s), a dry dock for the Port of Portland (1963), and the vessel RP FLIP (1962).