Fastline was a railway freight operator, which was part of Jarvis plc. It operated a fleet of Class 56 and Class 66 locomotives. The class 56s cost £700,000 each to refurbish. A fourth and a fifth Class 56 (56311 & 56312) were hired in from Hanson Traction Ltd. Fastline's base was at Doncaster, Yorkshire. It ceased trading when Jarvis plc entered administration and subsequently ceased trading in late March 2010. The company is in administration with N.G. Edwards, N.B. Kahn, P.S. Bowers and I. Brown of Deloitte LLP.
The company's main operation at first was 4O90, a container train to Thamesport on the Isle of Grain, which operated in the afternoon/evening, and returned in the early hours of the next morning, usually utilising Class 56 locomotives. Since the end of Fastline's container traffic flows from Doncaster to the Isle of Grain, the class 56s were intended to be used on Fastline's coal flows.