I thought the Train would never come

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 –