1st, I have to agree with Alan that the blue unit looks so mch better. 2nd, I have to agree with Brian tht it would look even better in DT&I orange.
And how! Yes. There were GP40's (6400-6405) and GP40-2's (6406-6425), although 6401, 6420, and 6425 are the only ones left on the CN roster. Remove the first digit and you have their former DT&I number.