supply of underground, armoured, unscreened railway signalling cable (heavy duty) with high conductivity copper conductor of size 12 core x 1.5 sq mm as per specn. no.irs: s-63/2014 (rev.4.0) with latest amdt.if any.underground, armoured, unscreened railway signalling cable (heavy duty) with high conductivity copper conductor of size 12 core x 1.5 sq mm as per specn. no.irs: s-63/2014 (rev.4.0) with latest amdt.if any.,underground, armoured, unscreened railway signalling cable (heavy duty) with high co nductivity copper conductor of size 12 core x 1.5 sq mm as per specn. no.irs: s-63/2014 (rev.4.0) wi th latest amdt.if any. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 2 %age , item category : special (signaling cables) , total po value variation permitted: not applicable ] ]