Train At Night

[Magpie]

It reads a lot easier now that you've put line breaks in it as opposed to the original long sentences.
You've got a good image and concept here, I've left a few notes below

The sound of an unseen train at night, - good image to start 
 Repeating over stuttering tracks  - don't need to capitalise each line unless it's a new sentence - stuttering tracks doesn't quite work for me, the sound seems like a stutter not the tracks, may need rewording
Into dark distance.  - dark seems redundant 

I am glad to be standing still, - could make this a new stanza - how about another word instead of 'still' it introduces some ambiguity - also comma at the end, which would actually negate the ambiguity, but another word would be better
Just outside my front door, - you could split this line into three
feet firm to the familiar. - this seems close to a cliché 
Listening. 

The train howl shrinks and I envy its transition. - this could be a new stanza - don't need train - is it a 'howl'? are we talking about the train or the train whistle - not so sure about envying a trains transition
How courageous at this late hour. - nice sentiment, but can a train be courageous? These last two lines don't quite work

The build up is good, although I would prefer some more poetic language and description. The last two lines as a conclusion are not quite working for me. Not sure about the personification of a train. Perhaps another way of concluding.

Also a new title could help as the current one is already within the poem.

Cheers for the read