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:
| Class (old) to 1868 | Railway number(s) | Quantity | Year(s) of manufacture | Type |
| --- | --- | --- | --- | --- |
| I a ( de ) | 1–6 | 6.0 | 1839–1843 | 1A1 n2 |
| I b | 7–15 | 9.0 | 1842–1843 | 1A1 n2 |
| II ( de ) | 16–19 | 4.0 | 1843–1844 | 1A1 n2 |
| III a ( de ) | 20–24 | 5.0 | 1844 | 1A1 n2 |
| III b ( de ) | 25–28 | 4.0 | 1844 | 1A1 n2 |
| III c ( de ) | 29–36 | 8.0 | 1845 | 1A1 n2 |
| IV ( de ) | 37–41 | 5.0 | 1845 | 1A1 n2 |
| V ( de ) | 42–46 | 5.0 | 1845 | 1B n2 |
| VI ( de ) | 47–54 | 8.0 | 1845 | C n2 |
| VII ( de ) | 55–58 | 4.0 | 1846 | 2′B n2 |
| VIII ( de ) | 59–65 | 7.0 | 1847 | 1A1 n2 |
| VIII ( de ) | 66 | 1.0 | 1846 | 1A1 n2 |
Question:
Can you tell me the Class (old) to 1868 that has the Quantity larger than 8?
Answer:
I b