Sitting there inside your mindJust waiting for the clock to chimeIn a lonely lineStood a lonely man
There are two poetic features here that heighten this sense of loneliness.
The verse is held together by assonance more than rhyme (the long i in "mind," "chime," and "line"), but this sound is lacking in the final line ("Stood a lonely man"), illustrating how this man is separate.
The phrase "lonely line" alliterates, and because the two words start with the same sound, there's a sense of this singularity.
