Ich muss früh gehen, um meinen Zug zu bekommen.

[mmautner]

English Translation

I am obliged to leave early to catch my train.

Is capitalizing “Zug” obligatory in this case?

[blogscot]

Is there a circumstance in which German nouns aren’t capitalised? Wenn ja, würde ich das gerne wissen!

[dlobok]

All nouns are capitalised, always.