What does OB stand for?

MLA style: "OB." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Ordinary-Break-(railway-defect)-(OB).html
Chicago style: Acronym Finder . S.v. "OB." Retrieved June 2 2012 from http://www.acronymfinder.com/Ordinary-Break-(railway-defect)-(OB).html
APA style: OB. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Ordinary-Break-(railway-defect)-(OB).html

Ordinary Break (railway defect)

This definition appears very rarely and is found in the following Acronym Finder categories:

Other Resources:

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Open Box Open Box (gaming clan) Open Burning (outdoor fire regulation) Opening Balance (financial management) Operating Budget Operation Barnabas Operation Battleaxe (gaming) Ophodni Brod (Croatian: patrol boat) Optical Branch Order of Battle		Organization Behaviour Organization Block Original Budget Orlando Bloom (actor) Oskar Blues (brewery; Colorado) Ossewa Brandwag Ossewa Brandwag (Ox-Wagon Guard) Out (of the) Blue Out of Bounds (National Park Service or golf slang) Out of Business

Samples in periodicals archive:

It is an ordinary break, and I don't think it has anything to do with the operation Emma had.

It is just an ordinary break and I don't think it has anything to do with the operation Emma had last January.