Tram ATM serie 1500, Milano

The ATM Class 1500, also known as Type 1928, is a series of trams operating on Milan’s urban tramway network.

By the 1920s, increasing traffic made it necessary to replace the aging "Edison" tramcars. Inspired by the Peter Witt streetcars from the U.S., Milan’s municipal engineers designed a new model in 1927. Carminati & Toselli built the first two prototypes, numbered 1501 and 1502, which entered service that same year.

Following successful tests, mass production of 500 units (1503–2002) began, involving multiple manufacturers, including Carminati & Toselli, Breda, and Officine Meccaniche. The trams featured electrical components from Ansaldo and TIBB, with Fiat-built bogies under a Commonwealth license.

Delivered between 1929 and 1930, the trams initially featured the Peter Witt system, which was phased out by 1940 in favor of a full rear door. Although many were damaged during World War II, only one unit was scrapped, with the rest being repaired by 1949.

In the 1970s, the original green livery was replaced with orange, and trolley poles were substituted with pantographs. Some trams were retired from 1976 onward.

Today, approximately 135 units remain in service, repainted in white and yellow. While most operate in daily transit, others serve special purposes, such as the ATMosfera restaurant trams, driver training trams, and the educational "Scuolaintram."