The famous BN E9s were rebuilt from BN E units by Morrison Knudson of Boise in 1973, Idaho to modify BN E9As with 645 power assemblies. A 500 KW Detroit Diesel replaced the steam generator for head-end power. I think they coul've kept going but but Metra relaced them with F40PHM-2s around 1990,
By the way these are some amazing images. I can hardly believe this is from 1987!