The Locomotion Reverberation

"The Locomotion Reverberation" is the fifteenth episode of the tenth season of the sitcom The Big Bang Theory. The episode will air on February 9, 2017.

Summary
Howard and Leonard try to make their invention even smaller without Sheldon who's busy trying to assemble a working train set. Raj and Stuart look after Halley while the girls take Bernadette out.

Extended Plot
The guys have finished working on their gyroscope making it the miniature size that the government wanted. Sheldon says that he can make it smaller. The guys are glad to be finished and send Sheldon away. Col. Williams comes in, sees Sheldon's work and wants it the smaller size.

Penny's Posse is meeting at Bernadette's house and decide to go out dancing. Amy wants to go see some Renaissance choir. They leave with Raj/Stuart watching Halley.

Amy gets home and Sheldon is excited about a train they could have running all over the apartment.

In apartment 4A, Leonard is trying to duplicate Sheldon's work to make the gyroscope even smaller. Sheldon is in 4B assembling his train track in a welder's outfit.

The girls are on their way dancing when the babysitter's call to say that her milk she left smells funny. Bernie is okay for them to use the spare milk. She also doesn't want Stuart to use it in his coffee.

Leonard is finishing his calculations and wants to trick Sheldon into looking them over. Later Amy is dreaming about Sheldon behind a huge locomotive all sweaty as they head out to see some train.

Thanks to Fandom Fussion

Credits

 * Guest starring:
 * Dean Norris as Colonel Williams
 * Pamela Adlon as Halley (Voice Only)
 * Teleplay: Steven Molaro, Maria Ferrari & Tara Hernandez
 * Story: Chuck Lorre, Steve Holland & Jim Reynolds

Critics
To be entered.

Trivia

 * Leonard, Sheldon, and Howard finally finish the gyroscope for the military, but are forced to make a smaller gyroscope when Colonel Williams sees Sheldon's plans for one.
 * Sheldon begins to take an interest in engineering.
 * Bernadette has her first girls' night since giving birth to Halley.

Quotes
To be entered.