Diesel 199/Behind the Scenes

The Railway Series
Diesel 199 is a fictional standard gauge diesel engine created by the Rev. W. Awdry.

He first appeared in The Railway Series book, Enterprising Engines, which was published in 1968. His last illustrated appearance was in 1980 Annual. However, he was last mentioned in Sodor: Reading Between the Lines, published in 2005.

Front of Diesel 199:

Television Series
In 1992, three stories from Enterprising Engines were adapted into two episodes for the third series of Thomas the Tank Engine & Friends. However, due to budgetary constraints, D199's introductory story, Super Rescue, was not adapted for television.

Despite not appearing in the television series, D199 has been featured in various merchandise ranges, magazines and appeared at many Days Out with Thomas events all around the United Kingdom. He was also featured on the Official Website between 2010 to 2015, as a hidden character profile, which is now no longer accessible.

Unlike his Railway Series counterpart, D199 was only featured with one face. His rear cab throughout most of his merchandise has a headcode reading "AC 10".