G'day Bob,
I have also noted this difference in manufacture with the VR (Victorian Railways) Newport Workshops carriers. You will also find that the rear lifting eyes are attached with 5 rivets - one in each corner and one in the centre. The hull number I can add to your list is #731 - LP2 made in 1941.
I have checked five different South Australian Railways hulls ranging from #1313 to #4588 and none of these have rivets (either hull or lifting lugs). I have also seen a Metropolitan Gas Company hull and this has no rivets.
Jared
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