Trams of Australia
Like the H class, these maximum traction bogie open toastrack cars were built at Randwick Tramway Workshops in 1906/07 for tourist traffic. As tourist cars they were based at Fort Macquarie Depot but moved to Newtown Depot during World War I and subsequently to Ultimo Depot during their last years of operation.
The M class worked spasmodically in routine service on the western suburbs lines as well as to the Racecourse and Showground. Their final working life was spent on peak hour services to Drummoyne and Erskineville.
The end platforms of trams were lengthed and enclosed after they entered service, in order to provide driver protection.
 Thanks to Greg Sutherland for all of this information.