Maybe a dumb question, but it's a difficult question to Google and it's not obvious from looking at it - Does anyone know what this "bump" or protruding piece on either side of the tender is for? It almost looks like it might be a small reservoir for sand or perhaps oil, or maybe a storage box for tools or a grease gun?
Thanks!
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That's a rerailer used when a truck derails.
They're painted yellow nowadays, but back in the day they were unpainted steel.
Rusty
Ah makes perfect sense, thank you for clarifying!
Thank you! I learned something new today. 
Dan Weinhold
Also called a "rerailing frog."
I always thought they where hanging on the side, but under the car. instead of on the side sticking out ?
clem k posted:I always thought they where hanging on the side, but under the car. instead of on the side sticking out ?
Correct. Thus that photo of the New York Central model, above is incorrect.
Does this engine have one over the first truck on the tender?
Well, they can hang on the side too, and stick out a little. But not really perpendicular to the track like on the NYC model:
BobbyD posted:
Does this engine have one over the first truck on the tender?
Yes, and notice how it is hanging down and inward at the lower edge.
Here is a shot of GN 51 with one hanging over its truck, I want to say it came from the factory with it. Later in life it was used all the time on the Great Smoky Mountain RR. They derailed all the time.
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