Design Variances
A total of 140 cars were built. Most were steel-bodied and had painted exteriors; however, six (G-2 series) experimental aluminum-bodied cars demonstrated the benefits of using aluminum for rapid transit car construction. The G-3 class cars were built as 'non-driving-motors' in that they had motorized trucks but were not equipped with an operator's cab or driving controls and thus could only be used in the middle of the train.
Read more about this topic: G-series (Toronto Subway Car)
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—Sidney Buchman (1902–1975)