MON 605
| 11/1969, became L&N 2704 |
U23B
| 37297 | 1 | 238135 |
MON 606
| 4/1970, to LN 2705, SBD 2705, SBD 3235, CSX 3235 retired 4/1995 |
U23B
| 37298 | 1 | 262846 |
MON 607
| to LN 2706, CSX 3236, retired 05/95 |
U23B
| 37299 | 1 | 108245 |
MON 608
| to L&N 2707, CSX 3237, retired 05/91 |
U23B
| 37300 | 1 | 77947 |