Trainyard Express is a remake of a game released in 2010 for mobile platforms. Now available for the revamped ZX Spectrum Next, it can be played on the real machine, or in an emulator.
It's an addictive puzzle game where the player's job is to guide the trains to the goal stations, combining trains and colours. It has a well balanced difficulty curve, and has tutorials to help learn the basic concepts.
And it's a FUN game to play!
https://davidprograma.itch.io/trainyard-express