20189 & 20142, 06.42 Welwyn Garden City-London King's Cross (3Z39, 12L), London King's Cross station
Wearing a mysterious headcode 20189 leads 20142 'Sir John Betjeman'
slowly into King's Cross' platform one working the 3Z39 empty stock from Welwyn Garden City. The stock would soon be filled with many enthusiasts and normals who just fancied a day out in Norwich working the 1Z39 charter to the famous East Anglian city.