Skip to main content
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Information Collection Notice
Trademark Concerns
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
Contact Us
Security
DMCA
© 1999–2026 Urban Dictionary ®
Mugs
Tees
Hoodies
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
noun: railroad acronym for "Flashing Rear End Device", the "black box" attached to the rear of most freight trains in the US since the 1980's, replacing the caboose. Officially known as an End of Train Device (EOT), this is attached to the rear coupler and air brake line of the last car on the train. The device incorporates a pressure sensor and a radio to transmit brake line air pressure back to the lead locomotive, and a flashing red light to serve as a warning marker to other trains at night. Also referred to in less complimentary terms as a "Fucking Rear End Device", due to the fact that early versions were heavy, cumbersome to handle, and not known to be especially reliable.
Text fits
Save
Cancel