Chitty Chitty Bang Bang is a 1968 musical-fantasy film directed by Ken Hughes, produced by Albert R. Broccoli, and with a screenplay co-written by Roald Dahl and Hughes. It is loosely based on the children's novel Chitty-Chitty-Bang-Bang: The Magical Car (1964) by Ian Fleming. The film stars Dick Van Dyke, Sally Ann Howes, Lionel Jeffries, Gert Fröbe, Anna Quayle, Benny Hill, James Robertson Justice, Robert Helpmann, Heather Ripley, and Adrian Hall.

Irwin Kostal supervised and conducted the music for the film based on songs written by the Sherman Brothers, Richard and Robert, and the musical numbers were staged by Marc Breaux and Dee Dee Wood. At the 41st Academy Awards, the film's title song was nominated for Best Song – Original for the Picture.

Plot
In the mid-1910s in rural England, Jemima and Jeremy, the two young children of widowed unsuccessful inventor Caractacus Potts, become enthralled by the wreck of a champion racecar. When they learn the car is due to be scrapped, they return home ("You Two") and beg their father to save it. To raise money, he attempts to sell one of his inventions, a musical hard candy, but the candy's whistle attracts a horde of dogs, ruining his sales pitch ("Toot Sweets").

That evening, Caractacus sings his children a lullaby ("Hushabye Mountain") before going to a carnival, where he attempts to raise money with another of his inventions, an automatic hair-cutting machine. It malfunctions, ruining the customer's hair, and, in order to escape the furious customer, Caractacus joins a spirited song-and-dance act ("Me Ol' Bamboo"). He earns enough money in tips to buy the car and rebuilds it, naming it "Chitty Chitty Bang Bang" after its unusual engine sounds. For their first trip in the car ("Chitty Chitty Bang Bang"), Caractacus and the children go to a beach to have a picnic. They are joined by Truly Scrumptious, the wealthy heiress to the candy company, and, though she and Caractacus have previously had heated encounters, everyone has a pleasant time ("Truly Scrumptious"). At the beach, Caractacus tells the children a story, beginning an extended fantasy sequence.

Caractacus' story
In the story, the nasty Baron Bomburst, tyrant of the fictional land of Vulgaria, attempts to steal Chitty. The family escape thanks to Chitty's miraculous transformation into a boat, and Truly goes home to Scrumptious Manor ("Lovely Lonely Man"). The Baron sends two bungling spies to get the car, but they fail repeatedly and eventually decide to kidnap Caractacus instead, but mistake Grandpa for Caractacus. As they fly away in their airship ("Posh!"), Chitty sprouts wings and propellers, and the family pursues the airship all the way to Vulgaria.

Grandpa is taken to Bomburst's castle, where the Baron has already imprisoned several other elderly inventors, and they are ordered to make another floating car, though their attempts fail ("The Roses of Success"). When the Potts party arrives, they find children have been outlawed in Vulgaria, as the Baron's wife, the Baroness, hates them. The kindly Toymaker harbours the Potts family and Truly in his toyshop. The group disguise themselves as jack-in-the-boxes to hide the children from the Child Catcher, but Chitty is discovered and taken to the castle. While Caractacus and the Toymaker search for Grandpa and Truly searches for food, the Child Catcher returns and traps the children. The Toymaker takes Caractacus and Truly to a grotto beneath the castle where the townspeople have been hiding their children ("Hushabye Mountain" (reprise)), and Caractacus concocts a scheme to free the people from the tyranny of the Bombursts.

The next day, which is the Baron's birthday ("Chu-Chi Face"), the Toymaker sneaks Caractacus and Truly into the castle disguised as dolls that sing and dance ("Doll on a Music Box/Truly Scrumptious (Reprise)"). At Caractacus' signal, the Vulgarian children swarm the banquet hall, overcome the Baron's guests, capture the Baron, Baroness, and Child Catcher. The Vulgarian adults storm the castle, while Caractacus, Truly, and the Toymaker free Jemima and Jeremy. After that, they join the fight against the Baron's soldiers. Chitty comes to save them and Grandpa is rescued. With the battle won, the Potts family and Truly bid farewell to Vulgaria and fly back to England.

After the story
As Caractacus' story concludes, an awkward moment ensues when the children ask Caractacus if the story ends with him and Truly getting married. Caractacus does not answer and tries to apologize for his children when he drops Truly off at her manor, saying that the difference in their social status would make a relationship between them ridiculous, offending Truly.
Returning glumly to his cottage, Caractacus is surprised to find Lord Scrumptious waiting for him with an offer to buy his candy to sell as a dog treat. Overjoyed that he has finally made a successful invention, he rushes off to tell Truly, inadvertently causing her to crash into the pond once more. He rescues her and they admit their love for each other. Then, as they return home, Chitty flies up into the sky once again, this time without wings.
("Chitty Chitty Bang Bang" (Finale)).

I remember this great film from Britain!

I see that in Abbot's Lea school in Liverpool England when I was young

and I'm happy that Dick Van Dyke was in that film after Disney's Mary Poppins

and there's a steam train bit and the railway line on the bridge before the 2 spies catched the wrong car

and there's great songs in this film, like the one the same name as the car

Fun movie for the kids if they can get past the first 20 minutes or so.