I wonder if Richard Allen Welch ever owned a beige or tan colored 1970 Ford Station Wagon. On April 7, 1975 a credible witness (an employee at IBM) reported to Mont County Police that he saw two girls gagged and bound in the back seat of a tan Ford station wagon. He remembered that one girl raised her head and was wearing gold wire rimmed glasses and resembled Sheila Lyon. He said the driver seemed nervous and ran a red light. This was in Manassas, Virginia and the car had Maryland tags. The witness now lives in Cary, North Carolina. I found a recent article on the internet about his account of that incident.
Posted as well in reply to you in the other thread:
The gentleman featured in the Cary newspaper article has posted here at WS in the past. In his posts, he goes into quite a bit of detail regarding his thoughts on the make and model of the station wagon.
A link to all his posts:
http://www.websleuths.com/forums/search.php?searchid=937380