F40PH is both a real Amtrak diesel-electric locomotive and a running /b/ joke in which anons dump photos of that locomotive to counter Furry Friday porn threads.

Where did F40PH come from?

The earliest archived F40PH posts on /b/ date to December 2006, when anons answered Furry Fridays with mass locomotive images.

What does F40PH mean?

F40PH is the EMD model designation of a 3,000-horsepower diesel-electric locomotive built for Amtrak starting in 1976.

How do you use F40PH?

A standard F40PH post means dumping a directory of locomotive photos into a Furry Friday thread, usually with the opening shout 'YIFFIN HELL, FURFAGS'.

Is F40PH still popular?

F40PH threads still appear on 4chan and other imageboards, mostly on Fridays or as nostalgic callbacks to the 2007 feud.

F40PH

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Published October 19, 2026

F40PH is 4chan's answer to Furry Friday: anons dump photos of an Amtrak diesel-electric locomotive to drown out furry porn threads on the /b/ board. The custom began in December 2006 and was formalized by February 2007 when an anonymous poster calling himself Vipper declared Fridays the day for F40PH train images. By August 2007, Urban Dictionary had logged F40PH Friday as the replacement tradition.

4chan memes weekly tradition memes furry fandom memes late 2000s memes trolling memes

Overview

A typical F40PH thread opens with the battlecry 'YIFFIN HELL, FURFAGS' and a flood of locomotive photos loaded in bulk via directory dumper software1. The subject of all those photos is the F40PH, a real EMD diesel-electric unit used by Amtrak since 1976, with a 3,000-horsepower 16-cylinder prime mover and a top speed of 103 mph6.

F40PH posters give the locomotive mock reverence, placing its scale alongside Chuck Norris and Billy Mays comparisons3. Urban Dictionary contributors describe it as 'the best locomotive Amtrak ever operated besides the AEM-7'6. Among hardcore railfans known as 'foamers,' the newer General Electric P42 'Genesis' is viewed as the 'anti-F40PH'3.

Gallery

Origin & Background

Platform

4chan /b/

Date

2006

Train-posting on /b/ as a response to Furry Friday goes back to at least December 2006, when the earliest archived instances appeared on 4chan2. Furry Fridays had been a /b/ ritual since 2005, with anons posting furry porn in bulk every Friday. Many /b/ regulars felt furry content did not belong on an anime-focused random board, so they answered each Furry Friday thread by drowning it in photos of the Amtrak locomotive1.

In February 2007, an anonymous poster calling himself Vipper formalized the counter-tradition, declaring Fridays as the day to post F40PH images instead of furry art5. By August of that year, a definition appeared on Urban Dictionary stating that F40PH Friday had taken over from Furry Friday6.

How It Spread

Beyond /b/, the counter-tradition reached 1chan.net, an imageboard devoted to trains and railfan culture, which hosted a dedicated F40PH thread7. YouTube users made tribute videos for the locomotive8. Hobbyist boards like Trains.com9 and Rail Forums10 saw their own F40PH threads.

Reception split along existing fault lines. Encyclopedia Dramatica and WikiFur both wrote up the trend11. Fchan, a furry-focused imageboard, bans any mention or image upload of F40PH on sight12. The In-Joke blog later called the whole feud 'the greatest internet victory of all time'4.

Over time, train-posting broke free from its anti-furry origins, with /b/ anons running Friday train dumps for years after the initial feud and posting locomotive images outside Fridays in genuine appreciation for the F40PH's place in American rail history1.

Timeline

2006-12

Earliest archived F40PH train-posts appear on 4chan's /b/ board as counter-responses to Furry Friday threads.

2007-02

An anonymous user named Vipper formally declares Fridays as the day to post F40PH photos instead of furry images.

2007-08

Urban Dictionary accepts a definition for 'F40PH Friday,' stating it has replaced Furry Friday on /b/.

2008-10

The In-Joke blog publishes a retrospective on F40PH Fridays, calling the feud 'the greatest internet victory of all time.'

How to Use This Meme

Participation typically means dumping a directory of F40PH photos into a Furry Friday thread, usually opening with the shout 'YIFFIN HELL, FURFAGS'1. Images are often ordinary train-spotter shots of the EMD unit; the comedy is in volume and context, not captioning3. Reception depends on the host board: /b/ anons take it as sport, while Fchan hands out immediate bans for any F40PH content12.