Raphael talks about being on a gravy train just like you would be on a regular train or on a bus or another form of transportation.

拉斐尔谈到乘坐普通火车、公共汽车或其他交通工具时就像乘坐普通火车一样。

A gravy train would be a really good situation financially – something either that is making you a lot of money or that is allowing you to spend a lot of money.

肉汁火车在财务上会是一个非常好的情况——要么让你赚很多钱，要么让你花很多钱。