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 (61, 81) 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 (141a, 141b, 141c) 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 (61, 81) 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 (141a, 141b, 141c) 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.