The major improvement was the use of motor alternators for the auxiliary supplies using static rectification, instead of the motor generator sets.
2.
Rather than have a motor generator set for such a small installation, which generated noise and required maintenance, these systems used a hand magneto.
3.
The electro-pneumatic brake was of a similar design to the 1938 stock, but the motor generator set was rather different, as it needed to supply alternating current at 110V and 850 Hz.
4.
These DC to DC power supplies have largely replaced the " old school " solution for high current DC voltage conversion which would have been a motor generator set, with a 12 volt motor driving a 6 volt generator.
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