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An idiom used to respond to an argument or stance they've heard so many times.they know what's coming next.
Boomer:I'm not sure about all these alternate energy sources! You know
Coal is..... Millennial: train!
Train! by 4realazitgits March 5, 2021

Train Whistle 

Train Whistle — the new “dog whistle”. The current idiom “saying the quiet part out loud” points to the idea that a new term must be used to discuss impolite political discourse. Dogs can her at a frequency that humans cannot; so, the old idiom “dog whistle” pointed to a subtle statement.

Well, in 2023, both irony and subtlety are dead hence the new term “Train Whistle. If you can’t hear you are deaf.
Visiting insurrection prisoners on the eve of the 30th anniversary of the Waco Texas standoff; scheduling a Republican Presidential rally in Waco Texas on the anniversary; and Trump’s proclamation that he is “THE RETRIBUTION” of the Republican Party and MAGA; Trump’s threatening doom and destruction if indicted — this — collectively — isn’t a dog whistle it’s a Train Whistle.

It’s in your face; and, there is no more “quite part” to say out loud. IT’S ALL OUT LOUD IN THE RANGE OF HUMAN HEARING!!!!!!

train mong

People who travel on trains and are utterly oblivious to anyone or anything in their immediate vicinity. They annoy all the time just by being in the same carriage and frankly should be culled.
Who the fuck is making all the noise licking crisp salts off their fingers? Oh yea, it's another fucking train mong.
train mong by Ow See April 19, 2018

train of thought 

Similar to the subway of unconsciousness and the airplane of logic, the train of thought is used to casually describe one's thought process. It is usually lost, sometimes derailed, frequently hijacked, and has been known to reverse course. Also, the train of thought is never stated to have a beginning or an end, and it is unknown whether there are any passengers on board.
Dang it, I lost my train of thought again.
train of thought by dan.s August 17, 2008

train bashing 

A bit like train spotting or train photting, but with the aim of actually travelling behind your favourite type of traction for as many miles as possible rather than taking numbers/photographs
I went train bashing the other day from Birmingham to Bristol behind a duff.
train bashing by train basher December 29, 2006

train wreck

describes something that is so bad that you don't want to keep watching or following but you just can't look away from it.
Zoe: "That show is like a train wreck, I can't stop watching!"
train wreck by sexii mama :D October 20, 2010