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 | Fleet number(s) | Manufacturer | Year made | Quantity made | Quantity preserved |
| --- | --- | --- | --- | --- | --- | --- |
| 0-6-0 — OOO | 0-6-0 — OOO | 0-6-0 — OOO | 0-6-0 — OOO | 0-6-0 — OOO | 0-6-0 — OOO | 0-6-0 — OOO |
| B | 0-6-0 | 321 | Rhode Island | 1887 | 1 | 1 |
| B | 0-6-0 | 323, 325 | Rhode Island | 1892 | 2 | 0 |
| B-1 | 0-6-0 | 326–333 | Alco -Cooke | 1902–1907 | 8 | 0 |
| B-2 | 0-6-0 | 334–339 | Alco -Schenectady | 1909–1910 | 6 | 0 |
| B-3 | 0-6-0 | 340–343 | Alco -Schenectady | 1912 | 4 | 0 |
| B-4 | 0-6-0 | 344–349 | Alco -Schenectady | 1915 | 6 | 1 |
| B-4 | 0-6-0 | 350–354 | Alco -Brooks | 1920 | 5 | 1 |
| B-20 | 0-6-0 | 2308–2313 | Schenectady | 1886 | 6 | 0 |
| B-21 | 0-6-0 | 2314–2316 | Brooks | 1892 | 3 | 0 |
| B-22 | 0-6-0 | 2317–2320 | Brooks | 1900 | 4 | 0 |
| B-23 | 0-6-0 | 2321–2328 | Brooks & Alco-Brooks | 1899–1809 | 8 | 0 |
Question:
What manufacturer made 6 and preserved 1?
Answer:
Alco -Schenectady