Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| GE-DL works no. | Year built | Built for | Original no. | New owner | New no. |
| --- | --- | --- | --- | --- | --- |
| 35261.0 | 1974-75 | Iscor | 1D | SAR | 34-501 |
| 35262.0 | 1974-75 | Iscor | 2D | SAR | 34-502 |
| 35263.0 | 1974-75 | Iscor | 3D | SAR | 34-503 |
| 35264.0 | 1974-75 | Iscor | 4D | SAR | 34-504 |
| 35265.0 | 1974-75 | Iscor | 5D | SAR | 34-523 |
| 35266.0 | 1974-75 | Iscor | 6D | SAR | 34-506 |
| 35267.0 | 1974-75 | Iscor | 7D | SAR | 34-507 |
| 35268.0 | 1974-75 | Iscor | 8D | SAR | 34-508 |
| 35269.0 | 1974-75 | Iscor | 9D | SAR | 34-509 |
| 35270.0 | 1974-75 | Iscor | 10D | SAR | 34-510 |
| 35271.0 | 1974-75 | Iscor | 11D | SAR | 34-511 |
| 35272.0 | 1974-75 | Iscor | 12D | SAR | 34-512 |
| 35273.0 | 1974-75 | Iscor | 13D | SAR | 34-513 |
| 35274.0 | 1974-75 | Iscor | 14D | SAR | 34-514 |
| 35275.0 | 1974-75 | Iscor | 15D | SAR | 34-515 |
| 35276.0 | 1974-75 | Iscor | 16D | SAR | 34-516 |
| 35277.0 | 1974-75 | Iscor | 17D | SAR | 34-517 |
| 35278.0 | 1974-75 | Iscor | 18D | SAR | 34-518 |
| 35279.0 | 1974-75 | Iscor | 19D | SAR | 34-519 |
| 35280.0 | 1974-75 | Iscor | 20D | SAR | 34-520 |
| 35281.0 | 1975 | Iscor | G01 | Kumba | 01 |
| 35282.0 | 1975 | Iscor | G02 | Kumba | 02 |
| 40400.0 | 1976-77 | Iscor | 21D | SAR | 34-521 |
| 40401.0 | 1976-77 | Iscor | 22D | SAR | 34-522 |
| 40402.0 | 1976-77 | Iscor | 23D | SAR | 34-505 |
| 40403.0 | 1976-77 | Iscor | 24D | SAR | 34-524 |
| 40404.0 | 1976-77 | Iscor | 25D | SAR | 34-525 |
| 40405.0 | 1976-77 | Iscor | 26D | SAR | 34-526 |
| 40406.0 | 1976-77 | Iscor | 27D | SAR | 34-527 |
| 40407.0 | 1976-77 | Iscor | 28D | SAR | 34-528 |
| 40408.0 | 1976-77 | Iscor | 29D | SAR | 34-529 |
| 40409.0 | 1976-77 | Iscor | 30D | SAR | 34-530 |
| 40410.0 | 1976-77 | Iscor | 31D | SAR | 34-531 |
| 40411.0 | 1976-77 | Iscor | 32D | SAR | 34-532 |
| 40412.0 | 1976-77 | Iscor | 33D | SAR | 34-533 |
| 40413.0 | 1976-77 | Iscor | 34D | SAR | 34-534 |
| 40414.0 | 1976-77 | Iscor | 35D | SAR | 34-535 |
| 40415.0 | 1976-77 | Iscor | 36D | SAR | 34-536 |
| 40416.0 | 1976-77 | Iscor | 37D | SAR | 34-537 |
| 40417.0 | 1976-77 | Iscor | 38D | SAR | 34-538 |
| 40418.0 | 1976-77 | Iscor | 39D | SAR | 34-539 |
| 40419.0 | 1977 | Iscor | 40D | Kumba | 05 |
| 40570.0 | 1977 | Iscor | G03 | Kumba | 03 |
| 40571.0 | 1977 | Iscor | G04 | Kumba | 04 |
| 40578.0 | 1977 | Douglas | D5 | Sheltam | 5/2602 |
Question:
What is listed in built for when the original number is 24d?
Answer:
Iscor