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The background image in this X-ray analysis sotfware page shows what looks like a trolley or train car on tracks with a sign that says "X-ray Now: Everybody over 14 years old".

Where might this have been and when? Was this practice widespread worldwide at some time in the past? What was the advertised purpose, and if there was an underlying purpose different than that, what might it have been?

Screen Shot of http://maud.radiographema.eu/moPTT/ click for full size view:

The background image in this X-ray analysis sotfware page shows what looks like a trolley or train car on tracks with a sign that says "X-ray Now: Everybody over 14 years old".

Where might this have been and when? Was this practice widespread worldwide at some time in the past? What was the advertised purpose, and if there was an underlying purpose different than that, what might it have been?

Screen Shot of https://maud.radiographema.eu/moPTT/ click for full size view:

The background image in this X-ray analysis sotfware page shows what looks like a trolley or train car on tracks with a sign that says "X_ray Now: Everybody over 14 years old".

Where might this have been and when? Was this practice widespread worldwide at some time in the past? What was the advertised purpose, and if there was an underlying purpose different than that, what might it have been?

Screen Shot of http://maud.radiographema.eu/moPTT/ click for full size view:

The background image in this X-ray analysis sotfware page shows what looks like a trolley or train car on tracks with a sign that says "X-ray Now: Everybody over 14 years old".

Where might this have been and when? Was this practice widespread worldwide at some time in the past? What was the advertised purpose, and if there was an underlying purpose different than that, what might it have been?

Screen Shot of http://maud.radiographema.eu/moPTT/ click for full size view: