Curved Rails

Curved Rails (4520-1) is the foundational expansion for the legendary 1990s LEGO 9V train system. Released in 1991, this simple yet vital accessory pack allowed rail enthusiasts to finally break out of the boring oval track layout and introduce sweeping curves and dynamic loops into their layouts.

This set is perfect for vintage train collectors and MOC builders expanding a classic 9V layout. With just 8 pieces, there's practically no building experience to speak of, but the functional value of adding conductive metal rails to your vintage train network is immeasurable.

Skip this if you are building with modern Power Functions or Powered Up track systems. Because these are classic metal-conducting 9V rails, they are completely incompatible with newer plastic-only track systems unless you are strictly collecting or retrofitting vintage setups.