A quiet time - drop one in railway receptacle (3-4)

'receptacle' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'a quiet time drop one in railway' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'quiet' could be 'sh' (both can be said to tell someone to be quiet) and 'sh' is located in the answer.
'time' could be 't' (abbreviation) and 't' is located in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
'railway' could be 'ry' (abbreviation for railway) and 'ry' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?