Hornby TT:120 TT8047 Junction Home SIgnal

Home signals with red square-ended arms are the stop signal at traditional signal boxes and can still be seen in use in some areas today. When horizontal these signals should not be passed as they warn that the line ahead is not clear form the train to pass.
Junction signals were used to indicate to a driver which route his train has been cleared to take at a junction. Normally there would be one taller post, indicating the main route and a shorter post indicating a secondary route, eg. a branchline, which diverges from the main route.