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 | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern | 4-8-4 — ooOOOOoo — Northern |
| A | 4-8-4 | 2600–2611 | Alco | 67010–67021 | 1926 | 12 | 0 | 1949–1959 |
| A-1 | 4-8-4 | 2626 | Alco | 68056 | 1930 | 1 | 0 | 1955 |
| A-2 | 4-8-4 | 2650–2659 | Baldwin | 61771–61780 | 1934–1935 | 10 | 0 | 1953–1958 |
| A-3 | 4-8-4 | 2660–2667 | Baldwin | 62163–62170 | 1938 | 8 | 0 | 1954–1958 |
| A-4 | 4-8-4 | 2670–2677 | Baldwin | 64155–64162 | 1941 | 8 | 0 | 1954–1958 |
| A-5 | 4-8-4 | 2680–2689 | Baldwin | 64667–64676 | 1943 | 10 | 0 | 1957–1959 |
Question:
What is the serial number of the model made in 1930?
Answer:
68056.0