| Qty. | Road | Numbers | Date | Builder's #s | Phase | Notes |
|---|---|---|---|---|---|---|
| DS 4-4-660, 139 built | ||||||
| 1 | AC | 13 | 6/46 | 72830 | Ia | American Cyanamid |
| 1 | Armco | 1001 | 10/46 | 73041 | Ib | |
| 1 | CW | 661 | 12/46 | 73045 | Ib | Chesapeake Western |
| 2 | CW | 662,663 | 12/46 | 73559,73560 | Ib | |
| 3 | C&NW | 1259-1261 | 3/49 | 73901-73903 | IIa2 | |
| 1 | CStPM&O | 71 | 3/49 | 73094 | IIa2 | C&NW Omaha |
| 2 | Erie | 381,382 | 11/46 | 73043,73044 | Ib | |
| 1 | Erie | 383 | 10/47 | 73366 | Ib | |
| 2 | Erie | 384,385 | 2/49 | 73898,73899 | IIa2 | |
| 1 | E&LS | 101 | 11/47 | 73367 | Ib | Escanaba & Lake Superior |
| 1 | GAN | 172 | 12/47 | 73368 | Ib | Georgia Northern |
| 4 | LI | 409-412 | 5/48 | 73628-73631 | IIa1 | Long Island |
| 1 | MF&M | 1 | 11/46 | 73042 | Ib | Morrissey Fernie & Michel |
| 3 | NOPB | 44-46 | 11-12/46 | 73038-73040 | Ib | New Orleans Public Belt |
| 3 | NOPB | 47-49 | 2/49 | 73895-73897 | IIa2 | |
| 2 | NS | 661,662 | 1/47 | 73361,73362 | Ib | |
| 1 | NS | 663 | 5/47 | 73365 | Ib | |
| 4 | P&BR | 306-309 | 10-11/46 | 73034-73037 | Ib | Patapsco & Back Rivers |
| 10 | PRR | 5957-5966 | 3-5/48 | 73618-73627 | IIa1 | |
| 9 | PRR | 9000-9008 | 3-4/49 | 73905-73913 | IIa2 | |
| 21 | PRR | 9009-9029 | 3-5/49 | 74236-74256 | IIa2 | |
| 20 | PRR | 9030-9049 | 5/49 | 74410-74429 | IIa2 | |
| 6 | PRR | 9110-9115 | 7-8/48 | 73632-73637 | IIa2 | |
| 1 | PRR | 9116 | 8/48 | 73641 | IIa2 | |
| 3 | PRR | 9117-9119 | 8/48 | 73638-73640 | IIa2 | |
| 1 | PRR | 9120 | 8/48 | 73642 | IIa2 | |
| 1 | PRR | 9121 | 8/48 | 73803 | IIa2 | |
| 23 | PRR | 9210-9232 | 11/48-2/49 | 73805-73827 | IIa2 | |
| 4 | PRR | 9233-9236 | 2/49 | 73889-73892 | IIa2 | |
| 1 | SSS&I | 30 | 9/48 | 73893 | IIa2 | Sloss Sheffield Steel & Iron |
| 1 | TVA | 100 | 2/49 | 73900 | IIa2 | Tennessee Valley Authority |
| 2 | WAB | 201,202 | 3,4/47 | 73363,73364 | Ib | |
| 1 | WS | D-100 | 9/48 | 73804 | IIa2 | Wyandotte Southern |
| 1 | WT | 104 | 1/49 | 73894 | IIa2 | Wyandotte Terimnal |
| DS 4-4-750, 53 built | ||||||
| 1 | AC | 14 | 3/50 | 74784 | III | American Cyanamid |
| 1 | ASW | 20 | 8/49 | 74674 | IIa3 | American Steel & Wire |
| 9 | ATSF | 525-533 | 7/49 | 74394-74402 | IIa3 | |
| 1 | BLW | 301 | 9/50 | 74813 | III | resold 1/56, Weyerhauser S-8 301 |
| 2 | CW | 51,52 | 8/49 | 74408,74409 | IIa3 | California Western |
| 4 | Erie | 386-389 | 8/49 | 74430/74433 | IIa3 | |
| 24 | PRR | 5595-5618 | 5-6/50 | 74720-74743 | III | fabricated frames |
| 2 | TM | 509,510 | 7/49 | 74594,74595 | IIa3 | |
| 1 | Warner | 14 | 4/50 | 74785 | III | fabricated frame |
| 2 | Weyerhauser | 101,102 | 5/50 | 74814,74815 | III | ex-BLH 750,751; resold 10,11/50 |
| 3 | YS&T | 608-610 | 8/49 | 74405-74407 | IIa3 | Youngstown Sheet & Tube |
| 3 | YS&T | 700-702 | 2/51 | 73657-73659 | III | fabricated frames |
|
Phases:
Phase Ia: original frame, 4 stacks, bevel grill (the VO-660 body), used only on American Cyanamid 13 (6/46). Phase IIa: redesigned cast frame, 3 stacks, distinct groups of upper louver sets (3-/48). IIa1 has a 3-louver set mounted low ahead of the sand fillers and another 3-louver set behind the right sand filler (3-5/48). IIa2 has a 7-louver set ahead of the sand filler (7/48-5/49). IIa3 eliminates the 7-louver set (7-8/49).
Phase III: straight side sill, redesigned cab windows, pair of tall louver sets on two bulged doors on the left side, hinged sand door (3/50-2/51). | ||||||
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