Reminds me of the moving platform idea a few years back. Essentially, platform trains would run on a loop, connecting to high speed express trains. It sounded

Reminds me of the moving platform idea a few years back. Essentially, platform trains would run on a loop, connecting to high speed express trains. It sounded unsafe, but maybe not more dangerous than a slip coach. https://io9.gizmodo.com/5863484/moving-platforms-let-you-get-on-high-speed-train-while-its-still-moving https://io9.gizmodo.com/5863484/moving-platforms-let-you-get...