Consider the following statements about sleepers used in railway engineering:
- Concrete sleepers have the highest service life among the mentioned sleepers, ranging from 50 to 60 years.
- The minimum CSI (Composite Sleeper Index) prescribed for track sleeper on Indian Railways is 783.
Which of the following statement is/are correct ?
1
Only 1 is correct
2
Only 2 is correct
3
Both 1 and 2 are correct
4
Both 1 and 2 are incorrect