The first two photos, the shadow made them 'un-RPesqe'
The third was just out of balance, had the train on the left half, and nothing on the right.
Don't get me wrong, the pics are great, it depicts railroad operations and equipment as is!
As for RP, I'll jump on the band wagon with the rest.... At one point when RP first started, I contributed a lot, then the tougher screening kicked in. I then found myself trying to get 'accepted' photos. Eventually I realized that this is not what the hobby is about, I'm a railfan who photographs trains, not a photographer photographing trains. I still contribute to RP, but my theory is this. I look at RP daily, just to see what's going on in the RR world, I also note what photos the screeners are accepting. I'll just spend a day or few hours out shooting trains, and sometimes I'll get a shot or two that looks like something RP may accept. For example, out of the 150 shots I took at TVRM railfest, I submitted 5 and only two got accepted, do I really care that only 2 were RP worthy? No! But I will tell you I have about 130 great shots and 20 so-so shots, and that's my opinion, and when it comes to my photos, that's all that matters. But the main thing I care about is that I had an enjoyable time trackside, and I may have captured a scene, equipment or other oddity that may cease to exist in the near future!
Also remember there are many more sites than RP, there's rrpicturearchives.net, locophotos.net, flickr.com, pbase.com, etc...