Peter whilst I am not by any means an avid train enthusiast I do appreciate elements of thoughtful composition use of colour and framing that create a pleasing visual image.
#1 is well well framed but the slate grey of the loco does nothing to aide to the impact of the image. I also don't know itf you had noticed Peter but someone empaled the loco with a telegraph pole
#2 and #3 both employ good use of vibrant colours but could benefit by some gentle cropping to get rid of visual distractions. In #2 a slice down the left side to remove the ugly fencing and store area in the lower left corner and remove a bit of left hand edge extra space would make for a tighter composition. I also love the white smoke plume against that vibrant blue sky (haven't seen such clear blue sky in weeks up here
In #3 a slither, this time, down the right edge to remove the steel rail in front of loco
#4 doesn't really attract me all that much apart from the glorious golden hue pervading the image
#1 for overall compositional quality, #2 for its visual impact and #3 for use of colour and the last for overall tonal appeal. Overall lovely set of images. For me you would be damn working hard on the day to beat that bullet train image in your first set Peter, bloody marvellous capture and definitely to be framed

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cheers
marco