Get yourself on a photography course - you can probably find a night course somewhere, and/or join a camera club. It'll improve your knowledge and technique immeasurably!
A DSLR with a great lens does not equal a great picture - in fact, if I'm anything to go by, about 1 in 20 is OK. In one camera club lecture by a famous Finnish photographer he stated that the difference between a pro and an amateur is that a pro takes 10,000s of c### pictures and experimented with every setting and post-processing option imaginable while an amateur takes a picture and wonders why it isn't like a pro's.
One of the issues with moving to a DSLR (apart from spending a small fortune on a bad lens habit
) is that a DSLR is designed to give you huge amounts of control *and* to give you a file (jpeg or raw) for post-processing - meaning Photoshop or Gimp (even Canon's software is fine). There's nothing wrong with post-processing - it isn't cheating; film photographers spent most of their time doing the analogous thing with chemicals. A DSLR is *not* for taking a quick picture - even though they have fully automatic settings - and is certainly not optimised for that mode of usage.
Photographers spend a lot of time setting up their workflow, from taking the picture through to the post-processing stages. This is something a course or club will help you with.
For example, the colours in a picture depend upon camera settings, the ambient light, the monitor, the colour space, the paper you're printing on, the file type etc etc.
There's a huge amount to learn and you're going to take 10,000s of c### photos
- just like the rest of us - and maybe, you get 1 or 2 real amazing pictures and many more that you can feel proud about.
So as a suggestion, try setting the camera to ISO800, 1/500th, f/13 (feel free to play with these, eg: bright day, drop the ISO) and just pointing at trains. Take the jpgs (easier to work with at first), stick them in Gimp or use the Canon tool, fiddle with the brightness, contrast, saturation and curves until you get something that pleases you.
And watch out for the lens habit...you will need a telephoto eventually, and a few primes, a wide-angle, a couple of zoom lenses, a 40mm prime is fun....
t.
Ian