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323240 emerges from the gloom of Birmingham New Street working the 09.08 to Wolverhampton 'stopper' service. The soundtrack to this class of unit as they get underway or slow down is a distinctive rising or falling whine. This is made through 'multiple phases caused by use of a gate turn-off thyristor-based inverters as part of the traction control circuitry that drives the 3-phase AC motors' - apparently! This was a common setup in the early to mid-1990s and could be heard on a number of units from this era such as the networkers, see..... https://www.ontheupfast.com/v/photos/21936chg/23868581604/x466021-2d33-sittingbourne-station
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