The Shanghai maglev has no security at all... or at least not last time I went on it. Neither do any of the European HSR systems I've been on.
Remember a big part of TSA isn't to protect the people on the planes, but to protect other people from the planes themselves. It's pretty hard to weaponize a vehicle that's stuck inside a tube or on rails.
Remember a big part of TSA isn't to protect the people on the planes, but to protect other people from the planes themselves. It's pretty hard to weaponize a vehicle that's stuck inside a tube or on rails.