In spot fx are engulfing candles stronger than railway tracks? As they essentially are railway tracks bit and a further range close?
IMO the shape is not that important. You could argue that engulfing reflects stronger rejection/reversal, but ultimately the cutoff points are arbitrary. For example, H4 candles plotted at GMT+2 offset will produce a different pattern to those plotted at GMT+1, and so forth.
In any case, candles are generally a lagging indicator, in that they depict where price has been. Whereas S/R (as one contrasting example) is a leading indicator - not only are S/R levels consistently visible across all timeframes, but they can tell you where higher volumes of orders are likely stacked, increasing the probability of a future lull/bounce at that level.