Z Scale › 4028 Wood Truss Rod Bridge (55' Span) Image 1 of 1 4028 Wood Truss Rod Bridge (55' Span) $28.00 Footprint: 2 7/8" to 3 1/4" between supports. Quantity: Add To Cart Added! Footprint: 2 7/8" to 3 1/4" between supports.