Iron Horse is a train card game (by R. K. Geier, published 1983 by Icarus Games) that uses a clever idea of distance between cities based on their Cartesian coordinates. The distance between 2 city cards is dx+dy (aka the Manhattan metric). Cities at the same coordinate are distance 1, rather than 0. E.g. the distance between Seattle and Chicago is 3+1=4. The distance between Seattle and Boise is 1. The United States are laid out on a 6x3 grid (with the southeast corner having no cities).
Salt Lake City
New York (x2)
|Los Angeles (x2)||Albuquerque
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