&quot;The Locomotive Manipulation&quot; -- Love is in the air when Sheldon (Jim Parsons, right) and Amy (Mayim Bialik, left) join Howard and Bernadette for a trip to wine country, on THE BIG BANG THEORY, Thursday, Feb. 6 (8:00 ÃÂ¢ÃÂÃÂ 8:31 PM, ET/PT) on the CBS Television Network.  Photo: Michael Yarish/WBEI  ÃÂÃÂ© 2014 WBEI. All rights reserved.