Re: Another X29 Question -- Coupler Operating Release Levers
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This is exactly what I suspected. NO GOOD after a particular date.Thanks for this confirmation.
On Thursday, May 13, 2021, 01:59:27 PM EDT, Jack Mullen <jack.f.mullen@...> wrote:
AAR interchange rules required rotary coupler operating levers on cars built new or rebuilt effective 8/1/33. That ended new applications of Carmer levers. I don't know of any interchange ban, but long after the time of this list, the 40/50 year rules would weed out cars still having them. Some lasted a very long time - last one I saw was on a C&NW flat in MofW service sometime in the first decade of the current century. The car would have been about 75-80 years old, and probably didn't last much longer.
The advantage of a Carmer lever is that the operator uses a pushing motion and can apply body weight rather than just muscle force. However, if the lever breaks, hand slips, or he loses footing, he's likely to fall between cars. Not a good outcome. I think the risks of foot operation are obvious. Evidently, if these risks were considered at the time, they weren't great enough to cause a ban, but may have been a factor in ending new applications and gradual replacement.
Besides the cost of the Carmer parts vs. what is basically a bent steel rod, the proliferation of different patterns of Carmer levers (Pennsy alone had a bunch) must have been a maintenance PITA.
Type E or F couplers can be either top or bottom operated.
Bottom operation is said to require less force on the operating lever than top operation. That implies less risk of injury.