All plastruct parts. 5/16 inch channels and I-beams for pillars. .030x1.25 ABS sheet for track girders. .030x1.50 cut ABS sheet for cross girders and curved corner bracing. .030x.250 styrene strip for girder sills. 3/32 inch angles for girder web, "X" bracing, lattice bracing, and Warren truss. .187x.020 cut styrene to support the bracing and truss at the joints. 5/8 inch beveled wooden cube for pillar support. .030x.187 styrene sheet to support extended ties. .187x.250 styrene rod for the extended ties. .125x.125 styrene rod for the catwalk.
I hope that's enough.