Not just that. I think the details of the actual project have become a casualty of journalism, as they do. It looks like someone combined parts of the push pull project with parts of making trains 26-long.
1. It's very wasteful to constantly have one engine at the rear just to handle ghat sections. This is why we have bankers, because the extra power isn't always needed. There's a case to be made for the extra power providing snappier acceleration.
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2. It's not possible to hit 110kmph on grades steeper than 1/125. The tracks are subjected to high forces. The example grades are 1/37 and 1/60, and those who've traveled there would remember that even downhill, the train doesn't go fast, because of these forces.
My other concerns aren't really concerns but curiosity to see how they'll pull this off. At peak TE, a train will now draw enough energy for two trains. Does this limit the number of trains that can simultaneously run in one traction section? How does shunting take place at the end of the journey now?