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Crossrail 3: A Long-Term Northwest to Southeast London Rail Link

This provides a new cross-London connection from the northwest to the southeast and is envisioned to take place long in the future after HS2, the Northern line split, the Bakerloo line extension, and Crossrail 2 have been completed. As demand continues to grow, the transport network will only become more crowded and something like this could be very beneficial.

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Safeguarding a corridor now is the cheapest insurance policy we can buy against future congestion. We should formally protect potential alignments in the London Plan this year, before development blocks every viable route.

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This corridor could finally connect outer boroughs like Harrow and Bromley directly, reducing the forced commute through Zone 1. For residents in those areas, a one-seat ride would be transformative for access to jobs and services.

Paris began planning the Grand Paris Express in 2008, and its first phase opens this year. London needs that same two-decade horizon — Crossrail 1 was conceived in the 1980s and opened in 2022. Start now or pay later.

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What could go wrong? A 30-year project that gets cancelled halfway, billions wasted on feasibility studies, and a safeguarded corridor that blights property values for decades. Show me the credible funding model before we talk about route selection.

This unlocks the kind of long-term thinking that built the Tube in the 1860s. A northwest–southeast link would open up new housing zones, reduce car dependency, and keep London globally competitive in 2050.

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The tension here is real: we need vision, but also fiscal realism. Perhaps we can agree on a low-cost first step — a safeguarded corridor and a strategic outline business case — that defers the big spending decision until Crossrail 2 is further along.

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