I would never use any traditional petroleum-based oil on trains. They dry out and can leave a gummy residue. I use a synthetic product called Break Free CLP (Clean, Lubricate, Protect). It was designed for use in automatic weapons, which reciprocate at high speed and high temperature and a gummed-up lubricant can get you killed. If it's good enough for a belt-fed FN Minimi at 700 rounds per minute, it's good enough for my Bild-a-Loco.
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