If you're good with people and don't mind doing a lot of lifting, then you would find this job enjoyable. With hard work and a smile on your face, you can make some decent tips. Nothing to write home about, but every little bit helps.
The only downside is it is unionized and the bad employees get exactly what the good employees get. There's almost zero discipline for employees that abuse the buses, the job etc. This means they make rules that ruin it for the majority because of a select few that are just plain bad workers instead of disciplining, re-training or replacing them. This may be a good or bad thing depending on your work ethic.