They may be on time at the railway station (6)
I believe the answer is:
tables
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see an association between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tables that I've seen before include "Turn these to reverse the odds" , "Items of furniture" , "Turn these to gain the advantage" , "Turn these to upset the odds" , "Turn these to gain the upper hand" .)