After great pain, a formal feeling comes –
The Nerves sit ceremonious, like Tombs –
The stiff Heart questions ‘was it He, that bore,'
And ‘Yesterday, or Centuries before'?
The Feet, mechanical, go round –
A Wooden way
Of Ground, or Air, or Ought –
Regardless grown,
A Quartz contentment, like a stone –
This is the Hour of Lead –
Remembered, if outlived,
As Freezing persons, recollect the Snow –
First – Chill – then Stupor – then the letting go –
This line with dashes between words,  represents the transition from agony to numbness, represented by the change that people physically undergo when exposed to cold. First comes the chill, which is extreme pain. Stupor is unresponsiveness. Letting go, then, can represent two things, either death or acceptance. Ultimately, the “letting go” will occur, the final loss of the “formal feeling” and, the reader can hope, an awakening of warmth and human-ness. 
 The narrator is overcome by extreme pain and sadness and “dies” as one would of hypothermia. However, “letting go” can also refer to letting go of the pain, and that death is some kind of permanent relief from suffering, perhaps symbolizing acceptance or coming to terms with what happened. 
 The dashes in the final line slow the pace, imitating the slow, gradual process of overcoming loss, grief and numbness to reach acceptance.
After great pain a formal feeling comes J341 F372