Unlikely as they haven’t been cored for the retaining screws and I don’t recognise the impressed identification stampsMy first thought is are those actual real rail chairs? They look a little shallow!
A standard chair is approx. 1foot four inches, that is 16 inches, the table is 17 inches wide, the “chair” the pictures is much smaller than that, so unlikely to be a a real chair I thinkI googled “t10146 BIBI”, as impressed on the casting, and found this…
... unless, perhaps, from a narrow gauge line in India, given the provenance of the product?A standard chair is approx. 1foot four inches, that is 16 inches, the table is 17 inches wide, the “chair” the pictures is much smaller than that, so unlikely to be a a real chair I think