Re: Retainer Valves

Tony Thompson

On Dec 21, 2020, at 1:34 PM, Dave Lawler wrote:

I understand that sometime in the mid 30s the government mandated that freight cars be fitted with AB brakes but many older cars
were not retro-fitted right away? 

   The mandate was for new construction and for "significant repairs or upgrades," obviously subject to interpretation. Older cars in many cases soldiered on until there was a ban on K systems in interchange.

Tony Thompson

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