4 0 0 ▁for ▁São ▁Paulo , ▁and ▁these ▁were ▁built ▁under ▁license ▁from ▁the ▁Bud d ▁Company . ▁ ▁In ▁addition ▁to ▁building ▁new ▁rail ▁vehicles , ▁M af ers a ▁also ▁carried ▁out ▁over ha uls ▁of ▁existing ▁rail ▁cars . ▁ ▁In ▁ 1 9 9 7 , ▁M af ers a ▁was ▁acquired ▁by ▁Al st om . ▁ ▁A ▁subs idi ary ▁of ▁Al st om ▁keeping ▁the ▁same ▁name , ▁M af ers a ▁SA , ▁continued ▁producing ▁rail ▁vehicle ▁components ▁( such ▁as ▁whe els ▁and ▁ax les ), ▁while ▁manufact uring ▁of ▁rail ▁cars ▁also ▁continued ▁but ▁now ▁under ▁the ▁name , ▁" Al st om ▁Trans porte ▁do ▁Brazil ▁S . A ." ▁ ▁Al st om ▁sold ▁the ▁technology ▁and ▁license ▁of ▁M af ers a ▁SA ▁to ▁M W L ▁Brasil ▁Rod as ▁& ▁E ix os ▁L t da . ▁in ▁November ▁ 1 9 9 9 , ▁and ▁this ▁company ▁continued ▁making ▁rail - ve h icle ▁components , ▁initially ▁under ▁the ▁M af ers a ▁name . ▁ ▁B uses ▁M af ers a ▁entered ▁the ▁field ▁of ▁bus ▁manufact uring ▁in ▁ 1 9 8 5 , ▁with ▁development ▁of ▁a ▁bus ▁ch ass is ▁and ▁a ▁mon oco que ▁( or ▁integral ) ▁t rol ley bus . ▁Production ▁of ▁t rol ley b uses ▁last ed ▁only ▁from ▁ 1 9 8 6 ▁until ▁ 1 9 8 8 ▁and ▁was ▁relatively ▁small , ▁tot alling