Formation
The G cars were originally designed in 2-car "married pair" formations, and were run in trains consisting of 2, 3 or 4 sets (4, 6 or 8 cars). When the G-3 class non-driving cars were introduced in 1956, 14 pairs of the G-3 class cars were inserted between G-1 class cars to form semi-permanently coupled 4-car trainsets, which could be coupled to the 2-car sets or operated on their own.
Read more about this topic: G-series (Toronto Subway Car)
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