Quote: the artist "diverted by lincoln! are they going over the humber bridge?'"
I'm guessing you don't travel by train very often then?
Trains will go to Newark then on to Lincoln, dependant on where the works are could mean going directly back to rejoin the line at Grantham or alternatively down to Peterborough via Spalding/Sleaford but there's no mention of missing out Grantham from the journey.
This is the latest from the National Rail website and shows that only Saturday afternoon trains until lunch timeySunday are affected.
"Diverted trains because of engineering work between Grantham and Newark Northgate
From 13:15 on Saturday 5 until 12:05 on Sunday 6 November 2011, First Hull Trains services between London Kings Cross and Hull are diverted via Lincoln. Journey times will be extended by up to 90 minutes."