I just recently copied most of the C drawing numbers and locations from the DPL files. What a lot of drawings but there must have been thousands more.
The info from DPL only divides the collection by File numbers such as C, L, A and other letters denoting general areas. The first number is size. The other numbers designate certain areas such as C-(dwg size)53 couplers and associated hardware. I did a sort on all the file numbers, and you can see by the drawing description what the other two numbers represent. Send me a PM and I can send the excel spreadsheet.
Bob Meckley