In reality its not a waste of resources, its more or less the same, in twin ALCos, more fuel is consumed yes, but high acceleration is achieved and hence over a long distance the twins prove to be useful, especially in scaling ghats, although EMDs are known to be more fuel efficient, their acceleration is relatively slower and its proven to take a single EMD close to 17minutes on a flat stretch to accelerate upto 100kmph, having said that the ghats will be difficult, more so for trains like KK which has a more aggressive schedule compared to other trains in the same route.