Soundproof materials for Railway 1. Soundproof theory 2. specifications: metal panelheight(m)length(m)thickness(mm)type0.5, 1.02.0, 2.5, 3.0, 4.080, 100shutter or perforatedPC/PMMA sheetheight(m) length(m) thickness(mm) light transmittance0.5, 1.0, 1.52.0, 2.5, 3.0, 4.0 80, 100 ≥80%post size(mm)100*100*6*8 ..