Do you mean double-shelf coupler? If so they were made mandatory on DOT spec
tank cars in 1978-79. I don't know how long thay had been around before
that, but I don't think for very long. I don't think they are a steam-era design.

Chris

I think, single shelf couplers may have first come in in the 1950s. Perhaps
that what someone told you.

Chris

Kadee has just come out with a #118 Type F shelf coupler in HO. When were these first used? Were gthey used on other than tank cars?

David Soderblom
Baltimore MD

While I know many don't like them I might point out that McHenry has a
AAR standard E shelf coupler. These are lower shelf. They are coming out
with a upper and lower shelf coupler around Christmas.

Jon Miller
AT&SF
For me time has stopped in 1941
Digitrax, Chief/Zephyr systems, JMRI user
NMRA Life member #2623
Member SFRH&MS

I don't think they are a steam-era design<

I was told "some" shelf couplers would fit my era. I don't remember the
entire dissertation but hopefully someone will jump in here that does.

Jon Miller
AT&SF
For me time has stopped in 1941
Digitrax, Chief/Zephyr systems, JMRI user
NMRA Life member #2623
Member SFRH&MS

The Type F that existed in the 1950's was a "tightlock"
design. It prevented cars from uncoupling as a result of
vertical motion. I can't imagine how Kadee could make a
good looking Type F tightlock that worked with existing
Kadee #5's. But a shelf coupler is relatively easy when
compared to that!