Like many burgeoning cities of its day, Pittsburgh's growth outstripped some of its necessary infrastructure, such as a water supply with dependable pressure. Because of this, on April 10, 1845, a great fire burned out of control, destroying over a thousand buildings and causing $9M in damages. As the city rebuilt, the age of rails arrived. In 1851, the Ohio and Pennsylvania Railroad began service between Cleveland and Allegheny City (present-day North Side). In 1854, the Pennsylvania Railroad began service between Pittsburgh and Philadelphia.