Marcon International has just announced the sale of two US tugs to Nigeria. Both tugs are based in Tampa, FL and are operated by OSG. OSG took over the fleet of Maritrans Operating Partners in 2006, which in turn took over SONAT which took over Interstate in 1987, but which has roots that go way back. See this excellent summary: http://www.tugboatinformation.com/company.cfm?id=57.
Both tugs date from 1971 and were built by Maine Iron Works of Houma, LA, and fitted with EMD engines. These are probably outdated now, but they sound great!
OSG Seafarer ex Seafarer is a 5750 bhp tug with an elevated wheelhouse. This device has been modified and raised at least twice. According to Marcon it now has a height of eye of 55 feet.
OSG Liberty ex Liberty ex Satoco is a 7200 bhp tug. Its elevated wheeelhouse has been raised again since my 1992 photo and now gives a height of eye of 57 feet. It was built for Sabine Towing and Transportation and bought by Interstate in 1985.Seafarer was the unfortunate tug in charge of the barge Ocean 255, loaded with avgas, when it was in collision with Balsa 37 resulting in a huge fire in Tampa Bay August 10, 1993.
The Maritrans tugs were always maintained in tip top condition, and had shipyard refits regularly, where they were sandblasted primed and repainted. It is no wonder then that they are still operating 40 years on.
See: www.marcon.com for more.