18 units – built by GMD, 1,200 horsepower, B-B trucks, operating weight 246,000 lbs. These units were equipped with steam generators as built, they were later removed. Originally classed as GRG-12n they were reclassed as GR-12n when their steam generators were removed.
| Number | Class | Built Date | Builder’s Number | Second number | Renumbered | Retired | Notes |
|---|---|---|---|---|---|---|---|
| 1900 | GR-12n | Sep 58 | A1449 | Dec 18 97 | Donated to Midwestern Rail Association, Winnipeg MB, 1999 | ||
| 1901 | GR-12n | Nov 58 | A1575 | 8 December 1997 | sold 1998 to National Railway Equipment, Silvis IL moved to the NRE-Alco shop in Capreol ON, 2001 leased to Algoma Steel, Sault Ste Marie ON, March 2000 | ||
| 1902 | GR-12n | Nov 58 | A1576 | 20 Feb 1996 | |||
| 1903 | GR-12n | Nov 58 | A1577 | 4 Dec 1995 | stored as unserviceable from Sep 1995 | ||
| 1904 | GR-12n | Nov 58 | A1578 | 8 December 1997 | sold 1998 to Southern Marine Equipment, Greenville MS moved initially to CLN Industries in Capreol ON but changed owners several times painted 1999 in the CLN shops: white with Ryder markings, RDMX 1002 sent to Mexico for use there | ||
| 1905 | GR-12n | Nov 58 | A1579 | 1997 | |||
| 1906 | GR-12n | Nov 58 | A1580 | 1984 | |||
| 1907 | GR-12n | Nov 58 | A1581 | 18 December 1997 | sold 1998 to National Railway Equipment, Silvis IL | ||
| 1908 | GR-12n | Nov 58 | A1582 | 17 Sep 1996 due to fire damage | |||
| 1909 | GR-12n | Nov 58 | A1583 | 4 December 1995 | |||
| 1910 | GR-12n | Nov 58 | A1584 | 18 December 1997 | sold 1998 to Southern Marine Equipment, Greenville MS moved initially to CLN Industries in Capreol ON leased to INCO, Copper Cliff ON, till late April 2001 | ||
| 1911 | GR-12n | 58 | A1585 | 22 October 1997 | stored as unserviceable due to frost damage for long period starting Jan 1997 | ||
| 1912 | GR-12n | Dec 58 | A1586 | retired 4 Dec 1995 | stored as unserviceable starting Sep 1995 | ||
| 1913 | GR-12n | Dec 58 | A1587 | 1402 | Mar 7 89 | ||
| 1914 | GR-12n | Dec 58 | A1588 | 1995 | |||
| 1915 | GR-12n | A1589 | 18 December 1997 | sold 1998 to National Railway Equipment, Silvis IL | |||
| 1916 | GR-12n | Dec 58 | A1590 | 1401 | Feb 21 89 | ||
| 1917 | GR-12n | Jan 59 | A1591 | 1400 | Feb 15 89 |