Re: Caboose restrictions
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In the time frame you are referring, the federal rules changed to requiring steel frames under cabooses.
Four wheel bosses almost always had wood frames and became illegal. The cause of the new regulation was that wood frame cabooses were getting crushed when a pusher loco was used behind them.
The replacement program almost always were 8 wheel cabooses. Used tender frames were popular platforms for new caboose bodies because of their size and availability. They were often pulled from scrap lines and sent to the car shops. Lackawanna was a user of old tender frames.
Many RRs were notoriously cheap when it came to providing maintained working facilities such as cabooses. Some rrs encountered union negotiated levels of maintenance of cabooses or equipment requirements.
This cheapness was demonstrated by several rrs operating in the central states, where they converted old boxcars. Transfer cabooses were an extreme example of cheap and minimalistic furnishing of equipment that had to be furnished for municipal operations.