Cigars of the Pharaoh: Derivation of "Sethru Jamjah"?

In the part where the Thomson Twins are chasing Tintin, Tintin hops aboard a passing train.
There is a scene in which the names of stations are shown to be running between. It appears to be a play on the English words that mean "See through jam jar".
Is this true ?

Correction: "Sethru - Jamjah" are the names of stations that the train runs between. Tintin is under the guise of an English woman passenger looking out of the window.

It's probably a word play. The original has "Sehru - Arboujah", with Sehru probably alluding to the Belgian village Céroux where Hergé owned a house.

Michael Farr mentions both versions & the play on words in one of his books.