The 2000 made refers just to the PS-2 4000.
I don't know that I've seen a list of all the buyers but we do have Tangent, BLMA and Exactrail for some of it-
CBQ, NP, CGW, KCS, NKP, MILW, CNW, WS, SOU, WAB, NW, BN, ICG, SP, ATSF, ACL, SLSF, CO, RI, GN, MON, CSX, NAHX (Great Western Malting).
The one I need the most is this one.
Jason