Re: Photo: CN Livestock Car 171320 (1925)

Marc Simpson

I think the sign says:
1st line - Car Under Test
2nd line - This Car Not Load - not sure about this one 
3rd line - Canadian National Railways

Canadian railways would often put wood over some of the openings in livestock cars in the winter due to the cold temperatures so that the cattle would retain some heat in the car.  
Marc Simpson

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