[CBQ] RPO structural requirements

["Rupert & Maureen" <gamlenz@ihug.co.nz>]

Re. truss rods and RPO’s.  I’ve had a quick look on the internet but can’t find anything specific other than -

 

“In 1912, the Railway Mail Service developed a set of strength requirements for new cars in an effort to push the car building companies into using steel for the cars' major structural components and underframes. The core of the requirements was that each car should be able to withstand a buffer force of at least 400,000 pounds.” 

There is no mention of the strength requirements for existing cars, although I found a comment suggesting the restrictions didn’t apply to branch-line service.

Can anyone clarify the situation?

Rupert Gamlen
Auckland                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

 

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