PHILADELPHIA (AP) - Commuters in Philadelphia are facing another day of transportation woes Wednesday as a transit strike enters its second day.

The walkout began early Tuesday after the Southeastern Pennsylvania Transportation Authority and a union representing about 4,700 workers failed to reach a contract agreement, shutting down buses, trolleys and subways that provide about 900,000 rides a day.Early Wednesday morning, SEPTA released a statement saying the two sides "continue to make steady progress in the effort to reach an agreement on a new contract." Talks are expected to resume later Wednesday morning.The strike wasn't supposed to affect commuter rail lines and service in areas outside the city, but the transit agency said at the start of Tuesday's evening rush hour that striking workers were preventing some regional train crews from reporting to work, causing the cancellation of a significant number of trains to the suburbs. SEPTA said it went to court and obtained an injunction to prevent pickets from blocking access to those facilities, but it warned riders to expect delays.Rail lines serving the suburbs were operating Tuesday morning, but were jammed and running late because of a surge in riders.Transport Workers Union Local 234 President Willie Brown said in declaring the strike that the sides remained far apart on pension and health care issues, as well as noneconomic issues such as shift scheduling, break time and other measures that affect driver fatigue. SEPTA said it was ready to resume bargaining.The transit agency, however, said if no agreement is reached before Election Day, it planned to seek an injunction to restore service.