I thought the Train would never come: Poem by Emily Dickinson

I thought the Train would never come -
How slow the whistle sang -
I don't believe a peevish Bird
So whimpered for the Spring -
I taught my Heart a hundred times
Precisely what to say -
Provoking Lover, when you came
Its Treatise flew away
To hide my strategy too late
To wiser be too soon -
For miseries so halcyon
The happiness atone -

Analysis of this poem