Did the transcontinental railroad connect California with East?

Yes, the transcontinental railroad connected California with the East. The first transcontinental railroad was completed in 1869, linking Sacramento, California, with Omaha, Nebraska. This line was built by the Central Pacific Railroad and the Union Pacific Railroad. The Central Pacific Railroad built the western portion of the line, while the Union Pacific Railroad built the eastern portion. The two lines met at Promontory Summit, Utah, on May 10, 1869, and the final spike was driven to complete the railroad.