On April 6, 2015, the city invited bids for the supply of four streetcars, with the issuing of a request for proposals to interested manufacturers.
In November 2015, the city awarded an $18.6-million contract to Brookville Equipment Corporation to build four "Liberty" model streetcars for Milwaukee.
A fifth car was added to the order later, to expand the fleet sufficiently to be able to serve the future Lakefront extension.

The city specified that the streetcars be capable of operating in service using only battery power part of the time, because almost one third of the line is not equipped with overhead wires; the batteries are charged when the vehicles are on the wired portions of the line.
The sections that will be operated on battery power only are along Kilbourn Avenue and Jackson Street.
All other parts of the line have overhead wires, although a portion of the future branch to the Lakefront area is also planned to be unwired.

The first of the five vehicles arrived in Milwaukee from Brookville on March 26, 2018, and made the first test run over a short section of the line on April 11.
The cars are numbered 01–05; each is 67 feet (20 m) long, weighs 83,000 pounds (38,000 kg; 38 t) and is designed to carry 120 to 150 passengers.
On May 14, 2018, the second streetcar was delivered, followed by the third on July 26.
The fifth and final car on order was delivered on September 7, 2018.
On April 6, 2015, the city invited bids for the supply of four streetcars, with the issuing of a request for proposals to interested manufacturers. In November 2015, the city awarded an $18.6-million contract to Brookville Equipment Corporation to build four "Liberty" model streetcars for Milwaukee. A fifth car was added to the order later, to expand the fleet sufficiently to be able to serve the future Lakefront extension.
The city specified that the streetcars be capable of operating in service using only battery power part of the time, because almost one third of the line is not equipped with overhead wires; the batteries are charged when the vehicles are on the wired portions of the line. The sections that will be operated on battery power only are along Kilbourn Avenue and Jackson Street. All other parts of the line have overhead wires, although a portion of the future branch to the Lakefront area is also planned to be unwired.
The first of the five vehicles arrived in Milwaukee from Brookville on March 26, 2018, and made the first test run over a short section of the line on April 11. The cars are numbered 01–05; each is 67 feet (20 m) long, weighs 83,000 pounds (38,000 kg; 38 t) and is designed to carry 120 to 150 passengers. On May 14, 2018, the second streetcar was delivered, followed by the third on July 26. The fifth and final car on order was delivered on September 7, 2018.
The Hop (streetcar)