AM5-M2 and AM4-M4
The AM5-M2 and AM4-M4 are two series of Alstom Metropolis heavy rail rolling stock that operate on lines M2 and M4 of the Budapest Metro . 
<triplet> M2 <subj> Budapest Metro <obj> part of <triplet> M4 <subj> Budapest Metro <obj> part of <triplet> Budapest Metro <subj> M2 <obj> has part <subj> M4 <obj> has part