There had been a tradition of volunteer fire companies in Philadelphia since 1736. In 1871 professional, paid firemen went into service. At that time there were some hundred fire companies, with enlisted membership of over 20,000 men total, although perhaps only 4,000 of those actually were interested in putting out fires. The rest just enjoyed their buddies, beer, and brawling. The paid staff would be comprised of 337 men in 22 engine companies and five hook and ladder companies. Base pay was $350 per annum. For an 8-minute video look at the history of the volunteer firemen in Philadelphia, see outside link here.
The Spring Garden Fire Engine Company No. 41 was established at 1903 Callowhill Street in 1851. At that time Callowhill Street, being north of Vine Street, was not part of the City of Philadelphia, but within the south edge of the Spring Garden District. In 1871 the building and equipment was acquired by the City and named Fire Engine Company No. 18.