MaffeiGermany
Magneti MarelliItaly
MAN SEGermany
MAN Truck & BusGermany
Manx Electric RailwayIsle of Man
Marmon-HerringtonUnited StatesMaschinen- und Waggonbau-Fabriks-Aktiengesellschaft in SimmeringAustriaMaschinenbau-Gesellschaft KarlsruheGermany
Maschinenfabrik EsslingenGermanyMatériel de Traction ElectriqueFranceMauri Bus SystemItaly
MazdaJapanMašinska Industrija NišSerbiaMCV Bus and CoachEgypt
Meadowbank Manufacturing CompanyAustraliaMelbourne and Metropolitan Tramways BoardAustralia
Mercedes-BenzGermany
Mercedes-Benz buses1926Metro-CammellUnited Kingdom
Metropolitan-VickersUnited Kingdom
MetrowagonmashRussiaMicro Mobility SystemsSwitzerlandMilburn Wagon CompanyUnited States
Minskas automobiļu rūpnīcaBelarus
MitsubishiJapan
Mitsubishi ElectricJapan
Mitsubishi Heavy IndustriesJapan
Mitsubishi MotorsJapanMittenwalder Gerätebau GmbHGermany
Modertrans PoznańPoland
ModuloHungaryMoscow trolleybus plantRussia
Motala VerkstadSweden
MPK KrakówPoland
Municipal Tramways TrustAustralia
MÁVAGHungary