[Ambassador]

I live in Northampton and can see trains from my house but cannot often identify individual loco's. Yesterday 3xDRS 37's went north about midday, coupled together, and todat a ATW 57 went south light at 6pm can anyone identify them. Also last Friday 24th June I heard a 31 or it could have been a 37 near Gunton north of North Walsham on the Cromer branch, how rare are loco's in this area?