James Bradley, Jr. Wrote:
-------------------------------------------------------
> I did a little research on the engine numbers
> provided to see if any of them were former SP,
> SSW, or DRGW locomotives. I found the following:
>
> UPY 163 = SSW/SP 7783 (B30-7), Built January 1980,
> Retired June 14 2004
> UPY 165 = UP 141 (B23-7), Built (unknown), Retired
> May 4 2004
> UPY 173 = SP 7789 (B30-7), Built (unknown),
> Retired May 30 2002
> UPY 175 = UP 235 (B23-7), Built (unknown), Retired
> October 30 2003
>
> UP 550 = UP 2050 (GP38-2), Built April 1975
> UP 551 = UP 2051 (GP38-2), Built April 1975
> UP 557 = UP 2057 (GP38-2), Built April 1975
> UP 597 = SP 4834 (GP38-2), Built June 1980
> UP 622 = MP 2122/UP 2122 (GP38-2), Built January
> 1975
> UP 630 = MP 2130/UP 2130 (GP38-2), Built January
> 1975
> UP 632 = MP 2132/UP 2132 (GP38-2), Built February
> 1975
> UP 636 = MP 2136/UP 2136 (GP38-2), Built August
> 1976
> UP 645 = MP 2145/UP 2145 (GP38-2), Built October
> 1977
> UP 683 = MP 2183/UP 2183 (GP38-2), Built January
> 1980
> UP 684 = MP 2184/UP 2184 (GP38-2), Built January
> 1980
> UP 690 = MP 2190/UP 2190 (GP38-2), Built February
> 1980
> UP 714 = MP 2214/UP 2214 (GP38-2), Built July
> 1980
>
> UP 1363 = DRGW 3111 (EMD GP40-2), Built December
> 1972
> UP 1364 = DRGW 3109 (EMD GP40-2), Built December
> 1972
> UP 1369 = MP 1369 (EMD MP15DC), Built January
> 1982
> UP 1373 = SP 3198 (EMD GP40P-2), Built November,
> 1974
> UP 1392 = SSW 7536 (EMD GP40-2), Built January
> 1979
> UP 1427 = SP 7940 (EMD GP40-2), Built April 1980
> UP 1435 = SP 7951 (EMD GP40-2), Built May 1980
> UP 1436 = SP 7953 (EMD GP40-2), Built May 1980
> UP 1446 = SP 2717 (EMD MP15AC), Built September
> 1975
> UP 1453 = SP 7941 (EMD GP40-2), Built April 1980
> (after merger UP 5353)
> UP 1480 = SP 7110 (EMD GP40M-2), Built February
> 1969 (rebuilt April 10, 1991)
> UP 1487 = SP 7117 (EMD GP40M-2), Built November
> 1969 (rebuilt May 24, 1991)

Try the numbers using a roster of "UPY" units and see if those make more sense.