SP F-units page: 1957-1958 F-unit swap between SP and T&NO
1965 Renumbering:
In 1957 and 1958, the SP and T&NO once again undertood an F-unit swap. This time, 13 of the original 16 F7's sent from the SP to the T&NO went back to their previous SP numbers in exchange for F3A's from the SP. The low 300 series had been vacated by the first group of F3's sent to the T&NO in 1952-1953 being rebuilt into F9M's.
T&NO F7A's back to SP:
| new SP number | prev T&NO number | |
| SP 6187 | T&NO 338 (2nd); orig. SP 6143D | |
| SP 6188 | T&NO 340 (2nd); orig. SP 6144A | |
| SP 6189 | T&NO 339 (2nd); orig. SP 6144D | |
| SP 6196 | T&NO 350 (2nd); orig. SP 6148A | returned 08/1960 |
| SP 6197 | T&NO 348 (2nd); orig. SP 6148D | |
| SP 6198 | T&NO 345 (2nd); orig. SP 6149A | |
| SP 6199 | T&NO 347 (2nd); orig. SP 6149D | |
| SP 6200 | T&NO 344 (2nd); orig. SP 6150A | |
| SP 6205 | T&NO 343 (2nd); orig. SP 6152D | |
| SP 6212 | T&NO 342 (2nd); orig. SP 6156A | |
| SP 6213 | T&NO 349 (2nd); orig. SP 6156D | returned 11/1960 |
| SP 6220 | T&NO 346 (2nd); orig. SP 6160A | |
| SP 6221 | T&NO 341 (2nd); orig. SP 6160D |
SP F3A's to T&NO:
| new T&NO number | prev SP number | |
| T&NO 300 (2nd) | SP 6140; orig. SP 6120A | |
| T&NO 301 (2nd) | SP 6141; orig. SP 6120D | |
| T&NO 302 (2nd) | SP 6142; orig. SP 6121A | |
| T&NO 303 (2nd) | SP 6166; orig. SP 6133A | |
| T&NO 304 (2nd) | SP 6167; orig. SP 6133D | back to SP 3/1960 |
| T&NO 305 (2nd) | SP 6168; orig. SP 6134A | |
| T&NO 306 (2nd) | SP 6169; orig. SP 6134D | |
| T&NO 307 (2nd) | SP 6170; orig. SP 6135A | back to SP 3/1960 |
| T&NO 308 (2nd) | SP 6173; orig. SP 6136D | back to SP 12/1960 |
| T&NO 309 (2nd) | SP 6174; orig. SP 6137A | |
| T&NO 310 (2nd) | SP 6178; orig. SP 6139A | back to SP 12/1960 |