What is the definition of Railway Fluid?

Alright, let's talk about 'railway fluid' – the unsung hero of our daily commute that's as mysterious as a ghost train conductor in a neon sign. It's that special lubricant that keeps our iron horses (or rather, trains) rolling smoothly, like they're on a never-ending dance party without a break. It's like the secret ingredient for a good ol' fashioned 'on time, all stations accepted' attitude.

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Now, here's a bit of edgy, unsettling sentence: "The ghostly whispers of the old locomotive's farewells to the railway fluid left me questioning if the train had actually left, or if it was just a really bad case of train fatigue."