You’d need a very big piece of paper to have it show up. There just isn’t that much new main track in the whole scheme of the U.S., and I don’t think it should be limited to just that since there are other ways to add a lot of capacity.
I think a more meaningful map would be to show lines where significant capacity has been added, through the devices of additional main track, siding extensions, signaling improvements, crossover and junction rearrangements, and line changes. For argument’s sake, you could could it if line capacity had improved, say, by 25% or better.
An off-the-cuff list of just UP projects I can think of in the last 20 years are:
UP Sunset Route, El Paso-West Colton, Calif., installation of second main track and new crossovers complete or in progress.
UP TP Line, Fort Worth to El Paso, new or renewed CTC, siding extensions, new sidings, heavy out-of-face replacement of rail and ties
UP Golden State Route, El Paso to Herington, Kansas, new or renewed CTC, siding extensions, new sidings, and heavy out-of-face replacement of rail and ties
UP Cal-P, Oakland-Sacramento, installation of second main track over Yolo Causeway, new crossovers, signal improvements, out-of-face rail and tie work, renewed CTC
UP North Platte Branch, O’Fallons to South Morrill, Nebr., siding extensions, new sidings, CTC installation, out-of-face rail and tie
UP Kansas Pacific, Denver to Topeka, Kans., new sidings, CTC installation, out-of-face rail and tie
UP Overland Route, Mo Valley to Denison, Iowa, new second main track, new crossovers, new signaling
UP Marysvale Cut-off, Gibbon Jct., Nebr., to Topeka, Kans., new second main track, new signaling, new crossovers
UP Overland Route, O’Fallons to Gibbon Jct., Wyo., new third main track, new crossovers
This is by no means a complete list …