William "Junior" Campbell (born on May 31, 1947 in Glasgow, Scotland, United Kingdom) is a Scottish composer, songwriter and musician. He was the co-composer of Thomas the Tank Engine and Friends along with Mike O'Donnell from 1984 until 2003.
He also composed the original Thomas songs and music for Thomas and the Magic Railroad.
- Really Useful Engine (with Mike O'Donnell)
Please visit the Thomas the Tank Engine wiki, upon which Shining Time Station is based.