I'd like to offer you some constructive criticism if I may. I'm not an amazing photographer myself, but I did notice one or two things about your images, which may or may not be missing elements for a wow factor image. This is just my opinion.
I am being extremely picky, but don't be disheartened, there is merit in what you are doing, but you want to improve...so here goes.
#1 Lighting is the main issue. The sky is blown and the foreground is underexposed, grey and a bit "meh". Ensure the sky and church are more prominent than the expanse of grey tarmac. Use the rule of thirds. I think you may have lost part of the image through perspective correction but I can only comment on what I'm seeing. It's not a bad photo by any means, composition is an "almost". But the thing you need to deal with here, is the limitation of dynamic range on your particular camera. This shot would require bracketing to be correctly exposed, in my opinion. Side note, a plain blue sky is never that inspiring, whilst often we have no choice, it's great to pick days where there are at least some clouds, to add interest. In short: imagine if you'd shifted the lens up and to the left a little more with the correct exposure (bracketing), and there were a few clouds in the sky. It's not a wow subject so you wouldn't get a wow image, but you'd improve it to a "postcard".
#2 Depth of field is a little shallow and focus point is too central. A wider angle take from further back would have assisted with DoF and also given further context. Alternatively, a perfectly framed and level side on shot would also have had greater impact. Remember, you can always crop a little, so shoot wider than you need in situations like this, to take advantage of the additional depth of field a wider angle offers, it can be of great benefit. Be wary of distortion, though, especially when down to 24mm or so.
#3 Composition is pretty good and subject is interesting. I'd have been tempted to frame a little more to the right. Not sure about the post processing, it seems a little over exposed to me, lacking contrast. I'd suggest a little more contrast which may also enhance detail in the steam. Again may never be a wow image, but definitely possible to make that into a good postcard!
#4 This is a good image. Framing is far better than #2 and so is focus and DoF. Over exposure of the sky has let you down here. Another candidate for bracketing as a blue sky would have infinitely improved this. Step back a little further, give more space between the front of the engine and the edge of the image frame, and also a little more space on the left by the steps, to give the feeling of being able to step inside. But, sky aside, it works.
#5 I'd crop a little more, the fence is uninspiring, the signal isn't. The track gives the lead in we need. To start with, use the rule of thirds, or shoot with a dead center subject. Sky has let you down here again. Doesn't quite look level to me either.
#6 Great image. The best of the set for me. Sky blown again, though.
To start with shoot wider angle than you perhaps wanted to help with DoF. Once you nail it, you can start to stop down when appropriate. Bracket your exposures when confronted with a scene which has both very light and very dark elements, it will really help. As will some decent software for dealing with that, such as Photomatix. You don't need to make it look like an infant's painting when creating a HDR image, even though HDR has a mixed reputation, don't be put off. It's necessary sometimes, to blend exposures.
A few of these have the makings of good photographs to my eyes. It's just technicalities letting the side down. With practice and a bit of reading, these would be relatively easy to address.
Using the rule of thirds will improve your pictures tremendously in the short, and probably long term. It may be a little cliche, but theres a reason we all use it. You may indeed find, that is the missing "wow" factor, you so desire, after you've sorted out your blown skies. You may benefit from learning how to use a histogram. It's not really that complicated but helps immeasurably. Your camera may have one built in which you can reference when shooting, to decide if you need to bracket the shot or not.
I hope you find the above to be useful.