Bigjigs Rail Curves and Straights Expansion Pack - Other Major Rail Brands are Compatible The Bigjigs Rail Curves & Straights Expansion Pack comes in handy whenever your little engineer redesigns their railway. Most other wooden railway brands are compatible with Bigjigs Rail. 24 piece set including straight and curved track pieces, varying in length. Suitable for ages 3+ years. Made from high quality responsibly sourced materials.