Train in Kings Cross: men expecting problem? (7,8)

I believe the answer is:

morning sickness

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'problem?' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'train in kings cross men' is the wordplay.
'train' is an anagram indicator (to train can mean to grow something into a shape).
'in'+'kings'+'cross'+'men'='inkingscrossmen'
'inkingscrossmen' is an anagram of 'MORNING-SICKNESS'.

'expecting' is the link.

Can you help me to learn more?

(Another definition for morning sickness that I've seen is " Expecting trouble".)

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