When one SIV fails, what is the expected operational change for the train?

When one Static Inverter (SIV) fails on a train, the expected operational change is primarily related to the management of electrical loads. If one SIV fails, the other SIV in a dual SIV configuration will take over some of the loading responsibilities, but it will not be able to operate at full capacity for both systems. Instead, it typically runs at a reduced capacity.

In this scenario, while the air conditioning systems can still function, they will not be able to draw on the full power as they would when both SIVs are operational. Running at 50% capacity on the affected unit allows the train to continue operating without a complete shutdown, while still providing some level of climate control.

This operational strategy is designed to maintain train functionality and passenger comfort as much as possible despite the failure of one component. Therefore, this understanding of how SIVs work and share the load underlines the expected behavior when one unit fails.