Yes, I remember Adlestrop ---
The name, because one afternoon
Of heat the express-train drew up there
Unwontedly. It was late June.
The steam hissed. Someone cleared his throat.
No one left and no one came
On the bare platform. What I saw
Was Adlestrop -- only the name
The harsh sound of the train and the man clearing his throat compare to the song of the blackbird in the last stanza. By extension, the acts and motives of man and his machines are harsh, compared to to tranquility of nature. 
 The two short simple sentences reinforce this contrast. Note the sibilant,  alliterative  ’s’s in ‘steam’ and ‘hissed’.
Adlestrop