It is 207 meters long, 36 wide and 50 high, and these gigantic size increases the grandeur of the main front. The main body is marked by three large openings that are very close to the tripartite solutions designed by the Romans for the thermal baths The sides reproduce the tripartite openings of the front and at the ends, show a remarkable profusion of decorative fountains and square anthropomorphic chandeliers strongly dominated by ornamental clocks. Just behind, a large opening gives access only to the Gallery of Carriages: it supported by two titanic Doric columns, above which rises a projecting cornice on which, at the ends of two lion heads accompany the logo of Railways two-winged allegorical.

Monumental buildings are also the two sides, which have tended to neoclassical,. The vertical impetus is concluded by corner pinnacles with monstrous figures, a cross between gargoyles and beasts come out of the medieval treatises. The the front door leads to the grand gallery of Carriages, supported by pilasters alternating square and covered by glass and parts with coffered ceiling. In these parts are included bas-reliefs of Labor, Commerce, Science and Agriculture,. Above the entrance there are four masks of Mercury, one of the symbols of progress and of the railways. Cyclopic is the Ticket gallery, 42 meters high, 62 wide and 32 long with a profusion of decorative extraordinary lamps Deco-style Japanese and the ornamentation of the bas-reliefs of Roman history. There are also sculptures with allegories of weapons and signs of the zodiac. Escalators and marble steps leading to the gallery head, which runs along all twenty-one tracks where the station is divided. Started by tripartite windows has a great decor and especially the beautiful views of Milan (at both ends), Florence, Rome and Turin (center) and the spectacular lights located on the pinnacles of access to the stairs leading to the exit side. Magnificent the canopy that covers the tracks.