Passenger services on the route were previously operated by First Great Eastern for commuter services south of Ipswich, and Anglia Railways for fast ''InterCity'' services beyond Ipswich. On 1 April 2004, these franchises were merged to form the new 'One' Railway franchise. Since January 2005, the line uses 110 mph Class 90Electric Locomotive s, although trains can only go 100 mph due to the outdated infrastructure. Before it used 40 year old Class 86 locomotives, which had a top speed of 100 mph.
