speed rail 

when you snort a rail of cocaine and then snort a rail of crystal meth immediately afterwards (or vice versa). A speed rail can also be when you chop up the cocaine and crystal meth at the same time and mix them together to create one fat rail that is comprised of both cocaine and crystal.

I think Felch is going to have a heart attack, he just took 5 speed rails

speed rail by Isak August 16, 2004

High-Speed Rail 

The topic of my debate. Kinda fast. Kinda slim. Kinda bad. Kinda good.

Kinda.....he looked kinda hot, standing there against the rails, sleek and humming with that positive electricity, thrumming like a heartbeat. I was flying fast above, I knew we’d meet again....but when? So far above him, he so far below me....but we were both made of that same steel. A plane and a train....two different worlds....so far apart....but I knew fate had us together from when I first saw him.

-to be continued.....

“What the hell is a high-speed rail?”

“A train that go whee.”
“Really? You have any fanfiction about it?”

“....”
“So there’s this thing called Urban Dictionary-“

High-Speed Rail by High speed > Low Speed October 22, 2022

High Speed Rail 

When an Asian couple are having sex so fast, that they are a blur to observers. There's lots of heat involved, so lubrication is critical. Note: they may be louder than typical.

Woah buddy, that Asian couple at the orgy was really getting the high speed rail going. I hope they used a lot of lube.

Yeah but the sound... wow!

High Speed Rail by msvxt December 3, 2023

High Speed Railway 

A really fast electric train that goes zoom.

Person 1. "I really want to go from LA to NY in a day but planes produce too much co2 too be viable"
Person 2. "Sounds like you need a High Speed Railway there fast and run on electricity which can be produced by solar power and such"

Example 2

"Man we really need a High Speed Railway all across our country"

High Speed Railway by mylilbitchboy October 5, 2020