What, besides gravitational warping of the time space continuum created by the earth's mass, were the reasons for the failure of the "strong" electromagnetic force, which is supposed to hold the choo-choo on the tracks, and not be overcome by the relatively "weak" forces of gravity?

It's a bit ironic that Pittsburg CA was named after Pittsburgh PA, because that is where the river steamboats took on that high quality Alameda Co. coal.....