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токопроводящий рельс stresses
construct.	side conductor rail; side-contact rail; contact rail; current-collecting rail; third rail
el.	conduct or rail
railw.	high conductivity rail
tech.	conduct rail; conductor rail; live rail

токопроводящий рельс: 4 phrases in 3 subjects

Makarov	1
Rail transport	1
Technology	2