A broken down train is causing cancellations to services between Ipswich and Felixstowe.
Disruption caused by the incident is expected to last until midnight.
The train broke down earlier this evening at Derby Road station.
A replacement bus service operated by Panther has been introduced but will not be able to call at Westerfield station.
Passengers wanting to travel to or from Westerfield should use a station help point to arrange alternative transport.
Journey times are now going to take 30 minutes longer than usual with the replacement bus service in operation.
Details on the bus stops can be found at www.nationalrail.co.uk/stations_destinations/default.aspx
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