Why isn't Doc convicted for hijacking the locomotive?
So, Doc and Marty hijack the locomotive at gunpoint, and then lets it crash into the Ravine. Marty/Eastwood is believed to have died in the crash.
Why isn't Doc prosecuted, convicted and jailed for this serious crime?
When he shows up in 1985 with Clara and their two sons, there is nothing indicating that he had been in prison for several years.