Caption: After making its afternoon station stop in Brampton, VIA 83 departs downtown with shiny lead FP9 6530 clattering over the Brampton diamond on the north track of CN's Halton Sub mainline. The tail end of a CN freight is visible on the south track just to the right. The intersecting line here is CP's Orangeville Sub (later Owen Sound Sub).

The Brampton interlocking diamond dates from 1879, when the Credit Valley Railway built their line from Streetsville to Orangeville and needed to cross the Grand Trunk Railway line (built 1856) at Brampton. Since the CVR (later absorbed by the CPR) arrived second, they were responsible for manning the manual interlocking tower and maintaining the interlocking plant. CP upgraded the diamond to an automatic CTC plant in early 1958 and demolished the tower, and CTC control was later transferred to CN when they upgraded their busier line from the Brampton Sub into the Halton Sub in January 1965. From that point on, CN was in charge of controlling traffic and maintaining the signaling system, but CP was still responsible for maintaining the physical plant (diamonds), even after selling their line to the Orangeville Brampton Railway in 2000.