The prominent air brake reservoir cylinders were relocated from the cab roof to internally.
The increased amount of equipment on board required more air cooling, now through mesh grilles on the sides of the covers.
[1] Originally there had been external walkways, with railings, outboard of the equipment covers but there was no longer enough width for these and the only handrails were for the steps to the cab.
[1] The locomotives were built in 1925 by the Officine Meccaniche Reggiane, reusing electrical parts from withdrawn railcars.
In order to use the electrical equipment, and the 650-volt motors, without excessive modifications, the metadyne system was adopted.