A multi-fuel rail apparatus for an internal combustion engine communicating a first fuel from a first fuel source and a second fuel from a second fuel source to a plurality of fuel injectors (31a, 31b, 31c and 32a, 32b, 32c), the multi fuel rail apparatus comprising: a first elongate member comprising one part and including a first longitudinal bore spaced apart from a second longitudinal bore and first and second fuel inlets for fluidly communicating the first and second fuels into the first and second longitudinal bores respectively, the first longitudinal bore has a first longitudinal axis and the second longitudinal bore has a second longitudinal axis, the second longitudinal axis spaced apart from the first longitudinal axis; and for each fuel injector the first elongate member includes a branch connecting structure protruding from an outer surface along the first elongate member for fluidly connecting the first longitudinal bore with a first branch connection and fluidly connecting the second longitudinal bore with a second branch connection, the branch connecting structure includes: a first boss integrated into and extending from an outer surface of the first elongate member for fluidly connecting with the first branch connection; and a second boss integrated into and extending from the outer surface of the first elongate member for fluidly connecting with the second branch connection; wherein each fuel injector is fluidly connectable to respective first and second branch connections to receive the first fuel and the second fuel from the multi-fuel rail apparatus through the first branch connection and the second branch connection respectively. a first elongate member comprising one part and including a first longitudinal bore spaced apart from a second longitudinal bore and first and second fuel inlets for fluidly communicating the first and second fuels into the first and second longitudinal bores respectively, the first longitudinal bore has a first longitudinal axis and the second longitudinal bore has a second longitudinal axis, the second longitudinal axis spaced apart from the first longitudinal axis; and for each fuel injector the first elongate member includes a branch connecting structure protruding from an outer surface along the first elongate member for fluidly connecting the first longitudinal bore with a first branch connection and fluidly connecting the second longitudinal bore with a second branch connection, the branch connecting structure includes: a first boss integrated into and extending from an outer surface of the first elongate member for fluidly connecting with the first branch connection; and a second boss integrated into and extending from the outer surface of the first elongate member for fluidly connecting with the second branch connection; a first boss integrated into and extending from an outer surface of the first elongate member for fluidly connecting with the first branch connection; and a second boss integrated into and extending from the outer surface of the first elongate member for fluidly connecting with the second branch connection; wherein each fuel injector is fluidly connectable to respective first and second branch connections to receive the first fuel and the second fuel from the multi-fuel rail apparatus through the first branch connection and the second branch connection respectively. <EOS>