An RPO catching the mail sack

For several years I've had a static display of a boiler room project of a mail crane and a couple RPO's with catcher arms. I decided that an operating
system would be something to try out. I modified the mail sack so it would come loose from the crane without derailing the car. See my staged photo of this nonsense at,
Phil Anderson
Up hill slow, down hill fast, tonnage first, safety last.

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