The Collaborative International Dictionary of English v.0.48:
Train oil \Train" oil`\ (oil`). [D. or LG. traan train oil, blubber (cf. Dan. & Sw. tran, G. thran) + E. oil.] Oil procured from the blubber or fat of whales, by boiling. [1913 Webster]WordNet (r) 3.0 (2006):
train oil n 1: a white to brown oil obtained from whale blubber; formerly used as an illuminant [syn: whale oil, train oil]