Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. British Rail Class 139 -  British Rail Class 139 is the TOPS classification for PPM60 model lightweight railcars built by Parry People Movers for use on the British rail network. The class were originally built in 2008 for operation on the Stourbridge Town Branch Line following an extensive trial with a prototype registered as a Class 999 unit.The first newly constructed Class 139 was shown on 28 June 2008 at the Tyseley Locomotive Works Open Day.
The answer to this question is:
Mean Of Transportation