G'day from Australia... and a question

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Hello everyone... I'm Don and I'm a big fan of North American trains. I've just found this forum which will be fantastic to work my way through. I watch a lot of youtube train videos and browse photo collections on flickr and just had a question about placard loads on tank trains. I've noticed a lot of tank cars that aren't displaying placards and had assumed that they might have been empties but I recently read that class 9 shipments don't always require placards, so I'm just wondering if no placard means class 9 or empty please?
Thanks very much for the welcome and answer Bill. I'll check out the link shortly, thank you. As far as photos go, I haven't been out for years but there's a couple of great channels on youtube I'd recommend.





There's also a lot of very high standard photo collections on flickr. A good place to get an overview of them (and then track individual photographers) is through the Railpage collection:


Thanks again!

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