For those who are interested in such things, based on open passenger consist data it appears that the longest trains on the British Network are Avanti Pendolino at 571 metric tonnes, and are the longest at 264.83m but the Greater Anglia 12 unit FLIRT while the most seats are on the Greater Anglia Stanstead Airport service with 702 seats on the 11 unit service.
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Are Prediction Markets Good for Anything?

We all know they’re casinos. It’s time to look at the data behind the froth.

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Polynomial autoencoder

A closed-form autoencoder: PCA encoder + quadratic Ridge decoder. On FiQA it gives 4× compression of mxbai-embed-large-v1 at -0.85 p.p. NDCG@10, +2.73 p.p. over PCA. No SGD, no neural networks.