hi, ur photo doesn't really work for me and i can't really put my finger as to why..:dunno:
but anyways here are some of my opinion...
composition is really not bad at all, i'd say good..:thumbsup:
b&W doesn't really work for this pic
your pic doesn't really emphasize the rain as per ur title my eyes kinda got attracted to the train...(hahahaha kinda rhyming rain and train...:bsmilie
my suggestion on how it could have been is
forget b&w..go color
slower shutter speed to catch the train whizz by giving sometimes nice,unique color renditions
but...shutter speed shouldn't be so slow untill that the falling raindrops creates a blur effect.. donno wether its possible or simply forget the rain....:bsmilie:
cheers