An exemplary capacitive touch sensor includes a first wire-like electrode and a second wire-like electrode. The onboard system corrects the train position based on the results of communication with a correction coil when the train has passed through the installation point of a correction coil. A retainer and a first return spring are provided on the valve. In the downward etching of the upper and lower planes during maskless etching, the 111 sidewalls will finally be replaced by 311 planes. The case includes holder means for holding the casing in at least one predetermined position while mobile.