As construction of the mainline was progressing west towards New Brunswick, the first two branch lines were built: in 1890, the 2 miles Sayreville Branch to access the Sayre and Fisher Brick Yards near the mouth of the Raritan River; one mile (1.6 km) of the Serviss Branch in East Brunswick was started in 1891, in order to access the sand and clay needed by Sayre and Fisher.