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On 29 August 1877, as part of preparations for the opening of the loop the following year, the GWR authorised expenditure for completion of the [[Absolute Block|block system]] between "the north and south boxes at Kidderminster" as well as block and single needle telegraph apparatus for the new line itself.<ref>[[Bibliography#Books|Marshall (1989)]] p. 128.</ref> The "south box" presumably referred to a new box built to control the junction, with the"north box" being the [[Kidderminster Station signal box (c.1882-1973)|main signal box]] in the station itself. The first Junction box was perhaps McKenzie and Holland with a 35 lever frame, replaced by a new 40 lever frame circa 1912.<ref>Signal Box Register, Volume 1: Great Western, revised 2011 edition, Signalling Record Society (plus correction sheet #9)</ref>
The illustration opposite shows two extracts from OS maps of the junction. In the 1903 map, the building to the east of the main line immediately south of the “Wooden Bridge” "[[Kidderminster Footbridge|Wooden Bridge]]" (FB) is not given the usual "SB" label, but appears to be the original Junction signal box. At least one subsequent map<ref>[[Bibliography#Books|Mitchell and Smith (2007)]] fig. V.</ref> did include "SB" for that building.
A later 1938 OS map which is reproduced as Fig. X in "Western Main Lines, Worcester to Birmingham via Kidderminster" (Mitchell & Smith) shows a signal box at a location further south, beyond the signal post (SP), with the original box no longer present. Narrative in the book accompanying the 1938 OS map extract refers to "''The 1924 Junction box''". The Signalling Record Society Website provides the information that "''A replacement GW type 28B box was built here in December 1937''".
==1953 signal box==
