Small steam, large steam, small diesel, large diesel, to the builder they are all the same. It's probably $150K+ nowadays before the builder is interested. So, he'll make you one SDL39, for $150K. Two for $75K each.
While Dash 9s are too old for me I do hope this project gets good traction (no pun intended).
I'd really like it if the Chargers or Sprinters for the Amfleets or the Viewliner IIs would get come traction but alas, no. Or ES/ET44s. Or the Tier4 SD70s.