On the weekly chart the trend has remained pretty much intact since January 2012, even with the recent pullback. Price did not breach the 50ma, and only spiked below the 100 figure.
But on the the pullbacks have become progressively deeper. However it is conceivable that UNP will return to its former linear trend. Yesterday's breakout bar confirmed a small doji-based flag on slightly higher . If it weren't for NFP today a buy opportunity could've been a possibility.
But for now I will wait for Monday (to avoid possible near term due to NFP) and reassess then.