As for which 1200s were which 1400s, I've seen partial/conflicting info
that I am unable to verify. For what it's worth I have seen info that
says 1201 was formerly 1489 or 1438 and 1202 is supposed to have been
1499. I can't verify this info, however.
When the units left Relco, some went straight into Chicago on the IC&E.
Others were delivered by the IC&E to Dubuque for the trip east on M338.
At the very least, 1202 & 1203 came through Dubuque.
Dave