I'm looking for the coordinates of the truncated 120 cell. They are given at the bottom of this page: http://eusebeia.dyndns.org/4d/trunc120cell
However when I use these coordinates I don't get the expected result. More likely I did a mistake, but I'd like to double check with another reference.
They seem correct here. When I construct a polytope with the specified permutations of the given coordinates in polymake, I get a polytope which is isomorphic to the truncated 120-cell produced by
wythoff("H4", range(0,1)). Polymake reports that they are not congruent, but I think they are similar, up to rounding errors. All the edges are of uniform length (2 with the coordinates given at your link, as compared to $\sqrt{2}$ with Wythoff's construction in polymake).Make sure you're getting all the right permutations. You will get $4\cdot 16 = 64$ vertices each from the first three points given, $12\cdot8=96$ vertices each from the next five points (the ones including 0), and $12\cdot16=192$ vertices each from the remaining nine points, for a total of 2400 vertices.