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:
| Builder | Model | Years of Daylight Service | Retired | Current Disposition |
| --- | --- | --- | --- | --- |
| ALCO | PA | 1953–1968 | 1968 | No survivors |
| EMD | E7 | 1953–1968 | 1968 | No survivors |
| EMD | E8 | 1954–1968 | 1968 | No survivors |
| EMD | E9 | 1954–1971 | 1971 | One survives; 6051 |
| EMD | FP7 | 1953–1971; All but 6462 sold to Amtrak in 1971 | Early 1980s (with Amtrak) | No survivors |
| EMD | SDP45 | 1967–1971; leased by Amtrak until 1974 | Early 1990s | No survivors |
Question:
What is the year of daylight service when the builder was Alco?
Answer:
1953–1968