Here are links to a few mentions of railways in the Grantham area which we've come across recently.
On the Grantham Matters website:
Track relaying, February 1987 (at nearly the same location as in 2019 above)
... 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.