Abstract: A rail structure of steel rail track and steel wheel vehicle includes a track and a vehicle, wherein the track comprises: two main steel rails, one or two auxiliary rails, or no auxiliary rails, and a turnout; the main steel rails and the auxiliary rails form a ballastless track or a ballasted track; the vehicle comprises: a vehicle body, a main steel wheel, an auxiliary rail guide wheel, and an auxiliary rail action component; the main steel wheel has or has no wheel flange, the tread is a cylindrical surface, and the left and right main steel wheels are independent rolling wheel pairs, not rigid wheel pairs; the main steel wheel rolls on the main steel rail, supports the weight of the vehicle, and drives and brakes the vehicle.

Abstract: A key and lock set for a vehicle includes: a vehicle lock set with both vehicle door lock and vehicle engine start lock; a passcode for mechanical lock; a rotary mechanical passcode dialer or push-button mechanical passcode keypad that is mounted in vehicle and accessible from vehicle outside; an electronic key in the form of a card key, tag key, passcode or biometric for an electronic lock, wireless key with a built-in power source, portable electronic appliance with key software or key hardware of cell phone, smart phone, tablet, computer, smart watch, digital camera or digital multimedia player; and an electronic key identifier that is mounted in vehicle for the electronic key.

Abstract: A car mobile phone connection device includes: a USB connector socket or a car cigarette lighter socket, and a mobile phone holder including a paired USB connector plug or a car cigarette lighter plug and a mobile phone connection holding mechanism; wherein the socket has one or more of sunken external thread, raised external thread, sunken bayonet slot, raised bayonet slot, screw holes; the plug has flange and internal thread locking cap, flange and bayonet locking cap, flange and screw through-hole plate and screws, or screw through-hole flange and screws; the mobile phone connection holding mechanism has a mobile phone connector plug, a wireless charging board, or an NFC communication board. The socket is installed in the car. The mobile phone is set on the mobile phone connection holding mechanism, fixed on the car through the plug and the socket, and connected to a power supply of the car.

Abstract: A car mobile phone connection device includes: a USB connector socket or a car cigarette lighter socket, and a mobile phone holder including a paired USB connector plug or a car cigarette lighter plug and a mobile phone connection holding mechanism; wherein the socket has one or more of sunken external thread, raised external thread, sunken bayonet slot, raised bayonet slot, screw holes; the plug has flange and internal thread locking cap, flange and bayonet locking cap, flange and screw through-hole plate and screws, or screw through-hole flange and screws; the mobile phone connection holding mechanism has a mobile phone connector plug, a wireless charging board, or an NFC communication board. The socket is installed in the car. The mobile phone is set on the mobile phone connection holding mechanism, fixed on the car through the plug and the socket, and connected to a power supply of the car.