Simplify the following text for a Grade 13 native English-speaking person.
Original: The station acted as a terminus for the Central Line , with passengers transferring to a steam shuttle onwards towards Epping , until electric services commenced as far as Loughton ( and around the ` loop ' to Hainault ) on 21 November 1948 .
Simplified: The station was a terminus for the Central Line , with passengers transferring to a steam shuttle towards Epping , until electric services began as far as Loughton ( and around the ` loop ' to Hainault ) on 21 November 1948 .