Periodically I get asked which camera is best for taking pictures of trains. I tend to really like small cameras that offer huge amounts of flexibility. I have DSLR's (Digital Single Lens Reflex) and the like, however I really like what are called Micro 4/3rds cameras for train photography.
Micro 4/3rds is mirrorless photography. That means that the cameras themselves differ a bit from an SLR as it has no mirror. However the body is significantly smaller and I still get the benefit of many options for interchangeable lens's. If you've never heard of Micro 4/3rds (and many folks haven't), there are tons of web articles on it.
Carrying around a giant camera to capture HD video or high quality colors (like in standard gauge) is a pain in the neck. What got me thinking about this is a price I saw on one of the best cameras out there. The body (I bought it for $550) came down to about $230. You'd need to buy a lens but the quality of the pics for low light layouts and the like is worth it. I also like the fact that this looks like a camera or at least like cameras used to. It isn't the high tech type of gadgety feel we all pretty much can't stand.
Check out the Panasonic GX1 here: great toy train camera.
No, I don't get paid or make any money from Panasonic or the like. But I do make great pictures with this camera and frankly it is way less expensive than when it was introduced. I also don't buy cameras to sell on eBay next week. I keep them for years (so you know how I think when I do have to make a purchase). Now go out and capture that standard gauge in action!!