My son loves Thomas, Percy, Toby, and Diesel 10 the most. Me, I like Diesel, Hiro, Spencer, and Mavis the best. Maybe that is why I noticed the anti-diesel "racism" of the Steam Team. But besides that, I like the series because each character is very different and has flaws that they have to overcome to get the job done. Plus the catchy songs teach children valuable virtues, like patience. The Reverend Priest Wilbert Awdry should be proud of what came from his bedtime stories to his son, Christopher.
This series is concluded in Part Four. After that, this whole topic is spun out unto its own blog at STEAMIES VS. DIESELS, which you can find at http://steamiesvsdiesels.blogspot.com/.