Between 1921 and 1923, the Toronto Transportation Commission ordered a total of 350 Peter Witt motor cars.

[1] The Peter Witt streetcars were the first new vehicles ordered by the Toronto Transportation Commission; however, they required a major change in the trackwork before they could run.

[3]: 17 Originally, all but the class P small Witt vehicles had a fully enclosed operator cab.

For heating, the motor cars initially had a coal stove which could be removed in warmer months to provide more seating space.

These cars were fitted with air whistles, large-flange wheels, and flag- and marker-light brackets.

They were mainly used to handle heavy crowds from Glen Echo to Bond Lake.

The class N trailers had two narrow centre doors flanking the conductor's position and were slow to load and unload.

These wood-body motor cars could pull a slightly longer, steel-body class N or Q trailer, which in later years could be semi-permanently attached together.

[2]: 59 The next major retirement came on March 30, 1954, with the opening of the Yonge subway (today a part of Line 1 Yonge–University).

The subway replaced the Yonge streetcar line, which had made heavy use of Witt trailer-trains.

On April 24, 1963, a few Witt cars were pressed back into service to handle crowds for a baseball game at Maple Leaf Stadium.

The tour service terminated after the 1988 season because of the worsening condition of the cars and the difficulty the TTC faced in obtaining parts.

However, despite this restoration, the TTC planned to restrict car 2766 for special events and not allow its use for charter or tour service.

The Witt uses an air-applied tread brake with an emergency stopping distance about 60 percent longer than that of a CLRV.

[9] In 2019, the shell of large Witt car 2500 was found abandoned at Haliburton Scout Reserve.