Birmingham signalling problems cause train delays 27 December 2012 Last updated at 17:11 Network Rail has warned of major delays after signalling problems left trains at a standstill at Birmingham International station. It said engineers were on site trying to fix the problem. Delays of up to 90 minutes are expected on services between Birmingham New Street and Milton Keynes. Virgin Trains and London Midland services are affected. Passengers can use Chiltern services between Birmingham and London Marylebone. London Midland services from Birmingham New Street were also delayed earlier, with the company reporting congestion at the station with limited platforms available after engineering work.