There has always been a sense of enigma around railways. From the choo-choo of a steam engine of yesteryear, the clackety-clack of wheels running on a joint on the railroad, to the horn of a distant train, announcing its arrival — it has inspired many works, right from children's literature and poetry to the first moving images on screen. For desi film buffs, there are iconic frames like the epic fight scene in Sholay. But what remains at the epicentre of this is the engine, one whose evolution has in many ways, coincided with India’s growth.

The WAG 7 is an AC-powered (A), broad gauge (W) engine suitable for goods (P) trains, also built in Erode Electric Shed. The number 7 in its name denotes that this locomotive is chronologically the seventh electric locomotive model used by the Indian Railways for goods service.