The original, and still my favorite version. Less restricted and less complicated than the modern remake, it held my interest long after the later, prettier version left me bored. Building the railroads across vast stretches of North America, or the smaller region of the UK or Europe, was easy to do, but challenging to do well. My kids learned numbers and set theory from helping me build trains when they were very young, but that's not the reason I would like to have this back - it was the locomotives more than anything, within a simple and enjoyable game that doesn't get bogged down in modern complications.