In compiling my roster of all Soo Line diesel locomotives, the category hardest to list is the GP40s, especially the ex-MILW units, since all locomotives were assigned new numbers after the 1986 Soo-Milwaukee merger, but not all locomotives were ultimately renumbered. So, here is a breakdown of what locomotives got what number when all was said and done. Hope this helps answer any questions that you might have.
GP40s Which Were Not Renumbered
(Numbers in parentheses are numbers assigned,
but not applied to the locomotive before retirement)
SOO 2003: ex-MILW 2003, ex-MILW 183
SOO 2008: ex-MILW 2008, ex-MILW 188
SOO 2010: ex-MILW 2010, ex-MILW 190
SOO 2011: ex-MILW 2011, ex-MILW 199
SOO 2013: ex-MILW 2013, ex-MILW 175
SOO 2014: ex-MILW 2014, ex-MILW 176
SOO 2016: ex-MILW 2016, ex-MILW 178
SOO 2025: ex-MILW 2025, ex-MILW 180
SOO 2026: ex-MILW 2026, ex-MILW 153
SOO 2031: ex-MILW 2031, ex-MILW 158
SOO 2032: ex-MILW 2032, ex-MILW 159
SOO 2033: ex-MILW 2033, ex-MILW 160
SOO 2035: ex-MILW 2035, ex-MILW 162
SOO 2036: ex-MILW 2036, ex-MILW 163
SOO 2038: ex-MILW 2038, ex-MILW 165
SOO 2039: ex-MILW 2039, ex-MILW 166
SOO 2041: ex-MILW 2041, ex-MILW 168
SOO 2045: ex-MILW 2045, ex-MILW 172
SOO 2046: ex-MILW 2046, ex-MILW 16, ex-MILW 2046, ex-MILW 173
SOO 2057: ex-MILW 2057, ex-MILW 17, ex-MILW 2057
SOO 2058: ex-MILW 2058
SOO 2059: ex-MILW 2059, ex-MILW 19, ex-MILW 2059
SOO 2064: ex-MILW 2064
SOO 2066: ex-MILW 2066
(Note: for units listed above, I have no record of what 4600-series
number they were assigned by Soo Line Railroad Company)
GP40s Assigned New Numbers But Not Renumbered
(SOO 4604): ex-MILW 2000, ex-MILW 191
(SOO 4605): ex-MILW 2001, ex-MILW 181
(SOO 4607): ex-MILW 2004, ex-MILW 184
(SOO 4608): ex-MILW 2005, ex-MILW 185; converted to fuel tender 4000 in
1987
(SOO 4616): ex-MILW 2017, ex-MILW 179
(SOO 4617): ex-MILW 2019, ex-MILW 193
(SOO 4618): ex-MILW 2022, ex-MILW 196
(SOO 4621): ex-MILW 2027, ex-MILW 154
(SOO 4622): ex-MILW 2029, ex-MILW 156
(SOO 4623): ex-MILW 2030, ex-MILW 157
(SOO 4625): ex-MILW 2037, ex-MILW 164
(SOO 4627): ex-MILW 2040, ex-MILW 167
(SOO 4628): ex-MILW 2044, ex-MILW 171
(SOO 4634): ex-MILW 2060
(SOO 4635): ex-MILW 2061
(SOO 4636): ex-MILW 2062
(SOO 4637): ex-MILW 2063
(SOO 4639): ex-MILW 2065
(SOO 4640): ex-MILW 2067
(SOO 4641): ex-MILW 2002, ex-MILW 182
(SOO 4642): ex-MILW 2007, ex-MILW 187
(SOO 4643): ex-MILW 2009, ex-MILW 189
(SOO 4646): ex-MILW 2018, ex-MILW 192
(SOO 4647): ex-MILW 2020, ex-MILW 194
(SOO 4649): ex-MILW 2023, ex-MILW 197
(SOO 4650): ex-MILW 2024, ex-MILW 198
(SOO 4653): ex-MILW 2034, ex-MILW 161
(SOO 4658): ex-MILW 2042, ex-MILW 169
(SOO 4659): ex-MILW 2043, ex-MILW 170