Possible spoiler...

Rating: 4/10 (8 March 2007)

... but definitely a plot hole. OK, so Doc Brown gets struck my lightening and the DeLorean ends up in 1885. it's left buried in a mine until 1955. A microchip is replaced with a 1950's equivalent that takes up most of the front of the car. It is sent back in time to 1885 where it sustains damage to the fuel tank. Now why bother with all the messing about with the train when there are now TWO DeLoreans in 1885 - the one Doc Brown sealed in the mine, and the one with new tires and a hole in the fuel tank. They could've placed the new not-so-microchip onto Doc Brown's DeLorean and left the holey tanked car in the mine. Bit silly really innit? But there were a lot of funny funny moments.