Change the narration: They said, "May train reach here in time!"

They Said that train may be reach there in time.

They prayed that train might reach there in time.

They Asked that train might be reach at station on time.

None of these

The sentence expresses a wish or prayer, so in indirect narration we use "prayed".

Changes:

So, the correct indirect narration is:

They prayed that train might reach there in time.