On Saturday and Sunday, October 20-21, Metrolink service will operate as scheduled on Orange County Line trains between L. A. Union Station and Laguna Niguel/Mission Viejo and on Inland Empire-Orange County Line trains between San Bernardino – Downtown and Laguna Niguel/Mission Viejo. However, a track maintenance project will disrupt service south of Laguna Niguel/Mission Viejo. As a result, Metrolink will provide alternate bus service for only OC Line trains 660, 661, 666 and 667 and IEOC Line trains 857 and 860. Riders can anticipate delays of up to 30 minutes as buses stop at connecting stations along the corridor. OC trains 662, 663, 664 and 665 and IEOC trains 859 and 858 will only travel as far as Laguna Niguel/Mission Viejo station, and no bus service will be provided for these trains. There will be NO Metrolink train service between Laguna Niguel/Mission Viejo and Oceanside.