she was stopped at mayfair midday friday, covered with grime and included two coaches each with several a/c units on top, a live-on subcontractor?, she didn\'t look like a the machinery that kicks-out and replaces ties, or gauges track, or tests track for weight-bearing, or replaces ballast, my best-guess is she re-treats ties w/creasote and/or treats ballast, much too large to be a weed-killer