Minor quibble, a side line is something you do aside a job/ or side by side a job. When it is your main means of making a living no matter how small or how far from a normal job it is , that is your work and not your sideline.

from Inquirer Blogs here please do read the whole thing:

Pushing trolleys to make ends meet
Posted under Everyday People, Videos

By Izah Morales

MANILA, Philippines – An economic crisis pushes people to engage in sidelines or extra jobs aside from the regular job they are already doing. But for 21-year-old Rodel Rosario of Los Baños, a sideline means the only way of making ends meet.

Pushing a trolley from “Crossing” to the International Rice Research Institute (IRRI) in Los Baños has become Rodel’s “sideline” for two years now.

“Kung walang trabaho, ito ‘yung sideline ko ang mag-tulak ng trolley[If I have nothing else to do, I push trolleys for sideline], ” he said.

Every morning and afternoon, he is like an ice skater gliding on the train tracks, his feet alternately stepping on the steel (instead of ice) to move the makeshift trolley forward. However, his movement is not as smooth and graceful like an ice skater because his “skating rink” is the railway and his so-called performance is to push the trolley that carries a maximum of five passengers.

A trolley ride costs P25, according to Rosario.