How are DC locos swapped for AC locos at the point where traction power changes from DC to AC?

Today 3/05 while the the Mumbai area is still mostly at 1.5kV DC, there are a couple of important AC-DC transition points such as Igatpuri -- 2/06 now Kasara -- and Virar. In time, when 25kV AC becomes the norm and DC traction is decommissioned, these transitions will be history and there will be no more traction changeovers! Sad for railfans, but perhaps more efficient for IR.

Already, CR has recently 2/06 switched the Kasara - Igatpuri section to 25kV AC. This is what used to happen at Igatpuri for a DC-AC change. The catenary connected to the DC power supply does not reach all the way to the catenary connected to the AC power supply; there is a neutral section between them.

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