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For those that keep bringing up the issue of difficulty electrifying routes that carry high freight cars, as it turns out Indian Railways has standardized on 7.57m (24.8") high catenary for routes that will be cleared to carry double stack freight trains. The normal catenary height in India is 6m (19.7').
Naturally high catenary requires more robust and bigger pantographs. Electric engines for use on high catenary routes are equipped with one pantograph of the larger size and the other one of standard size. Here is a video of a WAP-5 Class electric engine equipped with high panto operating on the Delhi - Rewari route (my old stomping grounds when I lived in Rajasthan in India).
Naturally high catenary requires more robust and bigger pantographs. Electric engines for use on high catenary routes are equipped with one pantograph of the larger size and the other one of standard size. Here is a video of a WAP-5 Class electric engine equipped with high panto operating on the Delhi - Rewari route (my old stomping grounds when I lived in Rajasthan in India).