While this won't help know when... they did run a double header on Saturday June 3rd (I was there for the 315 charter) because they wanted 463 to go out on the Chama train. I don't know how often 463 sees regular service but if you catch a day where she is running out of Chama, there will most likely be a K-36 giving her a hand. Other than that, you will probably have to wait for the fall colors to see actual trains full enough to warrant doubling out of Chama.
Brian Jansky
Houston, Tx
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