The Big Jigs Rail Heritage Collection “Rocket Engine” is a replica from the golden age of rail. The packaging includes information about the evolution and working life of the engine, upon which the replica is based. The iconic Stephenson's Rocket Engine, arguably the most innovative locomotive of its day has magnetic couplings to ensure compatibility with all other engines and carriages in the Big Jigs Rail range. No of Pieces: 2. Age: 3yrs+.