ATAC MB 100

The MB 100 is a rapid transit electric multiple unit operating on Line B of the Rome Metro since 1987.
==History==
The MB 100s are the third generation of rolling stock on the Rome Metro for use on Line B. Built by Breda Costruzioni Ferroviarie, the MB 100s were introduced in anticipation of Line B's extension towards Rebibbia. A total of sixty-two three-car sets were ordered and delivered from 1986 to 1992; the trains entered service in 1987 to replace the older MR 100, MR 200 and MR 300 trains which were moved to the Rome-Lido Railway following modifications and modernizations of the line by ACOTRAL preventing those trains from running. Breda Costruzioni Ferroviarie manufactured the sets's bodies and other mechanical components while Ercole Marelli manufactured their traction motors and Ansaldo their electrical systems.
Potential refurbishment works were tested on the MB 100s in 2005 with a significant interior refresh, installation of air conditioning and the application of a new livery. The trains were given new liveries in 2009 and 2020 in an attempt to combat the frequent acts of vandalism on the trains.
==Design==
Car bodies are constructed of an aluminum alloy. Each set consists of three semi-permanently coupled cars, which are coupled together to form six car consists. Each car has four doors per side. The cars do not feature open gangways but there are doors present intended to be used in the event of emergencies.
All three cars in each three-car set are powered cars. Each set, being semi-permanently coupled together, cannot be split apart without the use of specialist equipment available in depots.
==Specifications==
The MB 100s use Ansaldo armature chopper control systems, similar to what is used on certain MA 100 trains.
==See also==
*Lima Metro ML100, very similar type of rolling stock derived from the MB 100 for use on the Lima Metro
Category:Electric trainsets
Category:Breda locomotives
Category:ATAC locomotives
Category:Rome Metro locomotives