600400 series leased 60' P-S built DD boxcars

[NW Modeling List]

Hi, I see we have had a series on the 604xxx cars in the past, but I'm being blocked from searching the mail archive due to certificate issues.  
There's currently a query over on the BBFCL groups.io list and I am wondering if anyone can comment on or forward a run down of the numbers of cars in this series?  
I understand they are originally Wabash P-S cars. 
My Jan 1975 ORER has the numbers running 604007-52 but other information says the SP leased cars stated with 604006.  
L&N leased cars to the N&W in a series including cars 600430 and 600444. Unsure of the actual sequence. 
Were there cars 600400 - 600405 (or 600406)? If so, who did N&W lease them from ?  
Were there other lessors aside from L&N, SP and UP?
Which sequence of numbers covers the L&N cars ? 
Be grateful for any other information on these cars that I haven't covered .  You don't know what you don't know . . . 
Regards
Ben ScanlonLondon, England
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