The Medford bus was an extension of the Redding bus out of Stockton & Sacramento. Actually part of San Joaquin service. But it's been just Redding for a long time. For current buses see page 4 at: [
www.amtrak.com]
The only Martinez Amtrak bus connections are and were North Bay-North Coast. At one time, the North Coast bus ran to Brookings, but that's long gone too. Current bus (Capitol Corridor schedule) ends at Arcata Airport (McKinleyville) and is on page 2 at: [
www.amtrak.com]. Cap Corridor also connects with the Redding buses, see page 4.