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High Quality Content by WIKIPEDIA articles! The TransCanada pipeline is a system of natural gas pipelines, up to 48 inches (1219 millimetres) in diameter, that carries gas through Alberta, Saskatchewan, Manitoba, Ontario and Quebec. It is maintained by TransCanada PipeLines, LP. It is the longest pipeline in Canada. The completion of this project was a spectacular technological achievement. In the first three years of construction (1956-58), workers installed 3,500 kilometres of pipe, stretching from the Alberta-Saskatchewan border to Toronto and Montreal. Gas service to Regina and Winnipeg commenced in 1957 and the line reached the Lakehead before the end of that year. Building the Canadian Shield leg required continual blasting. For one 320 metres (1,050 feet) stretch, the construction crew drilled 2.4 metres (8 feet) holes into the rock, three abreast, at 56-centimetre intervals. Dynamite broke up other stretches, 305 metres (1,001 feet) at a time.

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