To Metra's credit, they seem to be able to keep locomotives running for a long time. The last F40 Amtrak had built for them isn't running for them anymore, but the first Metra F40 is (although, admittedly the Amtrak units probably saw a lot more "hard" work). My guess is that if funding can't be secured for more new engines, they'd run the first order of F40's through another rehab. If they can get funding for new units, then it seems like the smartest thing to do would be to get whatever they can from the new non-GM EMD, which might be more open to custom orders now that they're under new ownership, and certainly has the engineering staff to make them work right.