My local paper says under the heading On This Day In History that the last loco was built at Crewe.
I have done some searching as it didnt say which loco and this is what I have found --
"Today in 1958 (15th December) the last steam locomotive was built at Crewe.
It was the BR Standard class 9F No 92250 - the 7331st engine to be built from the beginning."
Just thought I would share that with everyone
Dave