I recently transcribed and TablEdited a fairly simple guitar tablature of Freight Train by Elizabeth Cotton. She was born in 1895 and wrote Freight Train when she was 12 years old. You will find links to the tablatures and midi I made from the transcription in the right-hand sidebar menu. Elizabeth or "Libba" as she was called played left handed with her guitar strung in the conventional manner. Watch her as she plays those alternating bass notes with her index finger! Freight Train
Watch Chet Atkins playing a medley that includes his rendition of Freight Train.