these developed into the world's largest carferry fleet that operated out of Ludington, Michigan. The entire fleet was in port and photographed on October 29, 1930. They were the Logan designed steel ferries S S Pere Marquette 15, S S Pere Marquette 17, S S Pere Marquette 18, S S Pere Marquette 19, and S S Pere Marquette 20. The S S City of Saginaw 31 (1929) and the S S City of Flint 32 (1930) were there also on that date as sister-ships of the fleet which were added after Logan's death. These subsequent vessels that were constructed were patterned after his boat designs. Logan boats The Flint and Pere Marquette Railroad ("F & PM") ordered in the late nineteenth century the construction of train transport carferries to carry their trains across Lake Michigan. Their first carferry was given the company's name to keep their name out front in public view. The SS Pere Marquette was the first steel train ferry in history. Logan was specifically selected to design it in 1895. This carferry was constructed in 1896 as a cross-lake ferry to endure the extreme weather conditions of Lake Michigan with the ice. The "Logan boats" had pilot houses with open upper levels and elevated bridge wings, twin smoke stacks with a slight angle slant, and no sea-gate. The Pere Marquette Railroad merged with two other railroad lines in 1900. The newly formed conglomerate company was called the Pere Marquette Railway company. It renamed and renumbered their freight ships in 1901. They started their numbering system with number 15. The first Logan boat constructed thereby received the number 15 designation. The ship's crews referred to her by just the number at the beginning. The name change which involved both the name with its number was not actually done until 1924. From then on it was officially known as the S S Pere Marquette No. 15. It was originally owned by F & PM and had departed on its maiden voyage out of Ludington on February 19, 1897. The merged companies brought in a wooden ferry from one of the other companies called Shenango No. 2. It was renamed the Muskegon since its original travel route across Lake Michigan was out of the town of Muskegon in Michigan and went to the city of Milwaukee in Wisconsin. It was the railway's fourth boat and renamed again later the S