"Gravy train" is an idiomatic expression that is used to refer to any lucrative endeavour.

The word "gravy" by itself was used prior to the invention of the phrase "gravy train" as an interjection of pleasure at something that's easy to do with a great reward, or as an adjective to describe such a situation, à la 'cushy'. An easy task.

In politics, "gravy train" refers to a depraved gorging on luxuries, since someone else foots the bill.

External links and references

• Michael Quinion "in the Courier of Connellsville (also in Pennsylvania) in November 1895, almost two decades before the previously oldest known example: Johnston claims that Reuben Nelson and another tall negro were in New Haven the night of the escape and that they broke into the lockup. Johnson further states that the next day Kelson laughingly told him that the New Haven lockup was "a gravy train." "