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Other inter-station walking connection from the existing via the sublime to the ridiculous ...
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Paris is building a short but important underground pedestrian tunnel to make it much easier for travellers to move between Gare de l’Est and Gare du Nord — two of the city’s busiest railway stations.

The new tunnel, about 56 metres long and more than 5 metres wide, is being dug beneath rue La Fayette in the 10th arrondissement. It will connect the ground-level hall at 50, rue d’Alsace near Gare de l’Est with the underground RER Magenta station, which itself is linked to Gare du Nord.

Today, passengers who want to switch between the two stations have to walk about 500 metres at street level, often against busy city traffic, which takes 10 to 15 minutes. The new tunnel will let people make the same connection in just a few minutes, deep underground and without crossing streets.

Work began in September 2024 and involves careful construction under a dense urban area. Because of tunnels, utilities and building foundations above, machines and traditional excavation methods are being used rather than a large tunnel boring machine.

The tunnel is part of wider improvements to the northern Paris rail hub, where daily traffic can reach around 800,000 travellers, including connections to metro, RER, regional trains and future services like the CDG Express airport train.

The pedestrian tunnel is scheduled to open in early 2027, possibly around the same time as the CDG Express line begins service, offering a faster, safer, and more comfortable connection between these two major stations

Euston St Pancras. It sounds like a station from some iffy bootleg tube map. But it's going to be a real thing. Hopefully.

While the fiasco that is Crossrail continues to drag its purple heels, plans are already simmering away for Crossrail 2 — a network that would link Surrey to Hertfordshire, via London. And one of the central London stations would be Euston St Pancras.