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95 Stock trains are equipped with insulated-gate bipolar transistors, I believe because they were built after the 96 Stock trains (the switch from gate turn-off thyristors was made in-between the two builds).
95 Stock trains are equipped with insulated-gate bipolar transistors, I believe because they were built after the 96 Stock trains (the switch from gate turn-off thyristors was made in-between the two builds).
Exactly right. 95 was used simply because that was the original designation for the Northern Line replacement stock, but it was delayed by a few years due to budget issues. By all rights it should really be 98 stock.