What are some of your favorite sporty engine schemes? I learned about this Rock Island retro scheme a few months ago and then found out that MTH did it. Although I mainly do CB&Q/BNSF, these were so attractive to me, I had to have them. Rest is history. Also always found the NP Canoe scheme on their GP units to have a lot of impact, would own one if it presented itself.
Even if they aren't the road you model, what are some of the schemes you've always found pleasing to your eye?