West Toronto Diamond

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The West Toronto Diamond is a Canadian railway junction in Toronto, Ontario.

Located near the intersection of Keele Street and Dundas Street, it is part of the Union Station terminal trackage operated by Toronto Terminal Railway (TTR). It links the tracks of Canadian National Railway with those of Canadian Pacific Railway. CP's West Toronto yard is located immediately to the west.

The junction was originally controlled by a complex interlocking built by Saxby and Farmer which controlled 21 switches, derails and locks, plus 17 signals. The interlocking was controlled from an interlocking tower located at the centre of the junction. In 1965 the interlocking was replaced with a modern centralized traffic control system operated by TTR from Union Station and the tower dismantled.

Design work is underway to convert the West Toronto Diamond into a flying junction to allow GO Transit trains to pass through the crossing without delays.

The West Toronto Diamond is often referred to as "the junction" and gives Toronto's The Junction neighbourhood its name.