James Nelson Williams (born January 21, 1962), known by the moniker D Train, is an American singer, songwriter, instrumentalist, producer and actor. He rose to fame in the early 1980’s with the release of his first album “You're the One for Me” (working with songwriter/producer Hubert Eaves III initially as a duo), which spawned his first US Billboard Dance chart number-one hit, "You're the One for Me". His debut album (under the Prelude Records label) would also chart with the hits "Keep On" and the much covered Burt Bacharach hit "Walk on By". He would go on to work with Eaves producing hits on the follow-up albums Music and Something's On Your Mind before the duo disbanded. He then ventured forth as a solo artist, retaining the D Train name and was signed to Columbia Records, producing more hit singles on the albums Miracles of the Heart and In Your Eyes as well as producing additional albums under his own label, including 701 Franklin Ave..

As a songwriter, D Train has written for numerous artists, including Patti Austin, George Duke, Carl Anderson, John P. Key and Vanessa Bell Armstrong. He has lent his voice on songs for artists such as Michael Jackson, Elton John, Carrie Underwood and Mary J. Blige among others as well as numerous television and film soundtracks. He also hosted “The D Train Show” for many years on Sirius XM Radio and has enjoyed great success as one of the leading jingle vocalists in the industry.