New tugs for old tugs

We started the day (Friday, October 17, 2014) with 4 Great Lakes Towing tugs, the Minnesota, Kentucky, North Carolina and North Dakota tied up at  their dock in Duluth. By noon, the tugs Indiana and Arkansas  had joined the lineup replacing the Kentucky and North Dakota. Above, the Indiana (2nd from left) and Arkansas (third from left) had joined the lineup.
That’s the Kentucky still tied up on the left; she will be leaving and the North Carolina is at the head of the line here. She will be staying along with the Minnesota. Below, the tug Missouri pulled the Arkansas and Indiana under the Lift Bridge this morning. Above, the Missouri (left) is still pulling the Arkansas and the Indiana while the North Dakota and Minnesota are behind them. Below, they break up while they get the new tugs tied up at the dock, one at a time. The Minnesota is bringing the Indiana in first.
We started the day (Friday, October 17, 2014) with 4 Great Lakes Towing tugs, the Minnesota, Kentucky, North Carolina and North Dakota tied up at  their dock in Duluth. By noon, the tugs Indiana and Arkansas  had joined the lineup replacing the Kentucky and North Dakota. Above, the Indiana (2nd from left) and Arkansas (third from left) had joined the lineup.
That’s the Kentucky still tied up on the left; she will be leaving and the North Carolina is at the head of the line here. She will be staying along with the Minnesota. Below, the tug Missouri pulled the Arkansas and Indiana under the Lift Bridge this morning.
Above, the Missouri (left) is still pulling the Arkansas and the Indiana while the North Dakota and Minnesota are behind them.
Below, they break up while they get the new tugs tied up at the dock, one at a time. The Minnesota is bringing the Indiana in first.
Kenneth Newhams :