A grease trail is an overland trade route, part of a network of trails connecting the Pacific coast with the Interior in the Pacific Northwest.
Trails were developed for trade between indigenous people, particularly the trade in eulachon oil (also spelled oolichan oil). The grease from these small fish could be traded for furs, copper, and obsidian, among other things. The Stó:lō people of the Fraser River simply ate the fish, either fresh or smoked, but the people of the interior used the oil as a condiment (similar to butter) and in various other ways.
Origin of the name 
"Grease Trail", Carrier /tl'inaɣeti/. The name comes from the fact that the most important item traded into the interior was the processed oil of the eulachon fish Thaleichthys pacificus. Indeed, the Carrier word /tl'inaɣe/ "eulachon oil" is a compound of Carrier /xe/ "grease, oil" (combining form /ɣe/) with /tl'ina/, a loan from Heiltsuk or Haisla, North Wakashan languages spoken on the coast.
Grease trails and former grease trails 
- Birchwater, Sage. Ulkatcho. Stories of the Grease Trail, Anahim Lake, Ulkatcho Indian Band 1993.
- Harrington, Lyn. (1953, March). Trail of the Candlefish. The Beaver Magazine Of The North. (pp. 40-44)
- Grease Trails, in: Turkel, William Joseph. The Archive of Place. Unearthing the Pasts of the Chilcotin Plateau, pp. 108-135.
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