In Northern Italy the 3 phase system was adopted around 1928 and lasted till the early 1970's when it was standardised to 3000 Volts dc, and its unfortunate demise.
I give you the link as well to see some more interesting photo's of these great machines.
http://www.photorail.com/phr1-leFS/e432.htm Class: E 432
3Ø at 3600 Volts 16.667 Hz
Max. output: 2200 kW. supplied by 2 x 1100 kW synchronous traction motors.
Drive via gears and jackrods.
Speed control was achieved by pole changing of the motorwindings via resistors and the 2 different motors itself
Speeds: 37.5 - 50 - 75 - 100 km/h.
Total weight 94 Tons, Adhesive weight 71 Tons.
1 D 1 wheel arrangement.
Total production 40 locomotives.
In normal use 2 pantographs are up to avoid stalling a train at low speeds across the isolated gaps in the 2 phases near points and railway yards. This 3Ø system originally was put in place around 1910 when the class 550 locomotives where used as the E 432 predecessors.
Source: "The great book of trains" and google class E432.