The car park at Harlington station in Bedfordshire, which is already partially closed off as a worksite, will close fully between Tuesday 23 and Saturday 27 December so that a crane can lower a new footbridge into place.
Network Rail is advising passengers to check before they travel this weekend that, as buses will replace East Midlands Railways and Thameslink trains south of Luton.
25 community projects across Bedfordshire, Cambridgeshire and Hertfordshire have received £479,988.20 from Govia Thameslink Railway.