Belton Box was open 1882 to 1922, according to M A Vanns in his GNR signalling book. But I agree, in railway terms, the area will, most likely, still have been known as Belton.
An alternative for the destination of the ordinary passenger train is Boston via Sleaford.
John
LNER Tender Numbering
Moderators: 52D, Tom F, Rlangham, Atlantic 3279, Blink Bonny, Saint Johnstoun