Alter the content of the sentence to use the past tense.
The train leaves at 6:00pm.
The train left at 6:00pm.
Complete the following task based on the instruction and optional input provided.### Instruction:
Alter the content of the sentence to use the past tense.

### Input:
The train leaves at 6:00pm.

### Output:
The train left at 6:00pm.