Photo: Unloading Fruit From A Livestock Car (UTLX tank car)

Bob Chaparro

Inflammable vs. Flammable

The third image link shows a tank car with a placard that reads "Inflammable". Both flammable and inflammable mean "capable of being easily ignited and of burning quickly".

In the 1920s the National Fire Protection Association urged Americans to start using the word flammable to avoid confusion and prevent fires because they thought people may mistake inflammable as meaning not being able to burn.

Sometime in the 1950s the ICC's regulations shifted to require the use of "Flammable" on placards. Perhaps someone knows the exact year.

Bob Chaparro

Hemet, CA