Turret deck ship
（重定向自Turret deck）
![Turret Chief running light; stepped hull form and raised midline](/Images/godic/202502/18/Turret_Chief,_19034826.jpg")
![The turret deck steamship Orange Branch in Townsville, Queensland about 1901. This view, almost bow-on, shows the turret hull's distinctive profile.](/Images/godic/202502/18/StateLibQld_1_234980_Loading_cargo_on_to_the_Grange_Branch_at_Townsville_docks4826.jpg")
A turret deck ship is a type of merchant ship with an unusual hull, designed and built in the late 19th and early 20th centuries. The hulls of turret deck vessels were rounded and stepped inward above their waterlines. This gave some advantages in strength and allowed them to pay lower canal tolls under tonnage measurement rules then in effect. The type ceased to be built after those rules changed.