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| Class | Wheel arrangement | Manufacturer | Year made | Quantity made | Quantity preserved | Year(s) withdrawn |
| --- | --- | --- | --- | --- | --- | --- |
| Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) | Joseph Hamilton Beattie (1850–1871) |
| Hercules | 2-4-0 | Nine Elms Works | 1851–1854 | 15 | 0 | 1875–1884 |
| Tartar | 2-2-2WT | Sharp Brothers | 1852 | 6 | 0 | 1871–1874 |
| Sussex | 2-2-2WT | Nine Elms Works | 1852 | 8 | 0 | 1871–1876 |
| Canute | 2-2-2 | Nine Elms Works | 1855–1859 | 12 | 0 | 1875–1885 |
| Saxon | 2-4-0 | Nine Elms Works | 1855–1857 | 12 | 0 | 1877–1885 |
| Chaplin | 2-2-2WT | Nine Elms Works | 1856 | 3 | 0 | 1876–1877 |
| Minerva | 2-4-0WT | Nine Elms Works | 1856 | 3 | 0 | 1874–1883 |
| Nelson | 2-4-0WT | Nine Elms Works | 1858 | 3 | 0 | 1882–1885 |
| Nile | 2-4-0WT | Nine Elms Works | 1859 | 3 | 0 | 1882 |
| Tweed | 2-4-0 | Nine Elms Works | 1858–1859 | 6 | 0 | 1877–1879 |
| Undine | 2-4-0 | Nine Elms Works | 1859–60 | 12 | 0 | 1884–1886 |
| Clyde | 2-4-0 | Nine Elms Works | 1859–1868 | 13 | 0 | 1883–1899 |
| Gem | 2-4-0 | Nine Elms Works | 1862–1863 | 6 | 0 | 1884–1885 |
| Eagle | 2-4-0 | Nine Elms Works | 1862 | 3 | 0 | 1885–1886 |
| Falcon | 2-4-0 | Nine Elms Works | 1863–1867 | 17 | 0 | 1882–1898 |
| 177 | 2-4-0WT | Beyer, Peacock & Co. (82) Nine Elms Works (3) | 1863–1875 | 85 | 2 | 1886–1899, 1962 |
| Lion | 0-6-0 | Nine Elms Works | 1863–1873 | 38 | 0 | 1886–1900 |
| Volcano | 2-4-0 | Nine Elms Works | 1866–1873 | 18 | 0 | 1886–1897 |
| 221 | 0-6-0 | Beyer, Peacock & Co. | 1866–1873 | 24 | 0 | 1891–1924 |
| 231 | 2-4-0 | Beyer, Peacock & Co. | 1866 | 6 | 0 | 1892–1899 |
| Vesuvius | 2-4-0 | Nine Elms Works | 1869–1875 | 32 | 0 | 1893–1899 |
Question:
What was the quantity preserved for quantity made of 15?
Answer:
0.0