Royal Mail vans have arrived at Glasgow Central station in July 1989 carrying mail bags for loading on the Travelling Post Office (TPO) Up Special train which left Glasgow Central at 19.30 for London Euston.
Published: Modern Railways magazine August 1991 p. 414 and in Johnson, P. (1995). Mail by Rail: The History of the TPO & Post Office Railway. Ian Allan. p. 43.