Here are links to a few mentions of railways in the Grantham area which we've come across recently.
On the Grantham Matters website:
The Harlaxton ironstone quarry line
Track relaying, February 1987 (at nearly the same location as in 2019 above)
Passenger numbers at Grantham station in 2017
Renewal of Barrowby Road Bridge, 1955
Grantham Guard Montague Ogden, Mayor in 1966-67
Barrowby Road Bridge is hit by a truck, February 2020
... and in the current (March 2020) issue of Steam World magazine:
pages 28 to, 33 carry an illustrated article titled 1962: a Spotter's Year by Bruce Laws, with his recollections of places including Colwick shed, and Nottingham Victoria and Grantham stations. Photographs include an A3-hauled passenger train on the Up goods line, a view of the Loco yard and Grantham B1 61389 bringing a goods train off the Nottingham line.
Please let us know (via our Contact Us form) if you come across similar items, so that we can share them.