We have been looking at potential houses to buy and had kids in tow. On arrival Ds talks to lady of the house obsessively about whether she has a tape measure. She indulges him both in conversation and by providing one 
Upon leaving I thanked her for entertaining Ds and she responded 'my pleasure. I have a son who likes trains'.
Now Ds is still young and though I feel like I've been in the SN all my life I am actually fairly new. Is this 'code', a bit like a password to let us know she'd recognised ASD and has experience herself?
Or does it simply mean her Ds likes trains - end of!?