Road Numbers as delivered in the initial order of 120 units...
F7 A&B...
A units...
6140A-6169A
6140D-6169D
B units...
6140B-6169B
6140C-6169C
Total in order: 60 x A units & 60 x B units.
In 1949 SP decided to remove it's system of alphabetic suffixes, existing f7's were renumbered into two groups - and new f7's entering service were also classified in the new way.
A units...
6180-6445
6463-6470
B units...
8080-8305
Total in this listing : 274 x A units & 226 B units.
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