A Rail Drone can include: a payload interface, a drivetrain, and a rail platform(515). The Rail Drone can additionally or alternatively include any other suitable set of components. The Rail Drone can integrate a standardized payload interface and an autonomous electric road vehicle platform into a rolling stock architecture. The Rail Drone can be a stand-alone, payload-agnostic, motive element which can be independently or cooperatively capable of carrying heavy loads across long distances at various cruising speeds.

A semiconductor device of an embodiment includes a silicon carbide layer having first and second plane, the silicon carbide layer including trench having a first portion and a second portion, the second portion having a width smaller than the first portion, an n-type first silicon carbide region, a p-type second silicon carbide region between the first silicon carbide region and the first plane, a p-type third silicon carbide region between the second silicon carbide region and the first plane and having a p-type impurity concentration lower than the second silicon carbide region, an n-type fourth silicon carbide region between the third silicon carbide region and the first plane, and an n-type fifth silicon carbide region between the second portion and the second silicon carbide region and having an n-type impurity concentration higher than the first silicon carbide region; and a gate electrode in the trench.

An electric rotating machine according to an embodiment includes a stator element, a rotor element, and a housing. The rotor element is rotatable about a rotation axis. The housing houses the stator element and the rotor element, and is provided with an electric insulating portion on a part of or whole of an inner surface including a surface facing at least one of the stator element and the rotor element.

A semiconductor device according to an embodiment includes: a silicon carbide layer; a silicon oxide layer; and a region disposed between the silicon carbide layer and the silicon oxide layer and having a nitrogen concentration equal to or more than 1×10.sup.21 cm.sup.−3. A nitrogen concentration distribution in the silicon carbide layer, the silicon oxide layer, and the region have a peak in the region, a nitrogen concentration at a first position 1 nm away from the peak to the side of the silicon oxide layer is equal to or less than 1×10.sup.18 cm.sup.−3 and a carbon concentration at the first position is equal to or less than 1×10.sup.18 cm.sup.3, and a nitrogen concentration at a second position 1 nm away from the peak to the side of the silicon carbide layer is equal to or less than 1×10.sup.18 cm.sup.−3.

A modular intermediate circuit for a power converter has at least two or more intermediate circuit capacitor modules connected in parallel and in a chain, each intermediate circuit capacitor module having a first terminal, a second terminal, and at least one first intermediate circuit capacitor, which is electrically connected with the first terminal and the second terminal. First terminals of the intermediate circuit capacitor modules each following immediately one after another in the chain are connected in each case through a first low-resistance, high-inductance connection and a first high-resistance, low-inductance connection that is connected in parallel thereto. Second terminals of the intermediate circuit capacitor modules each following immediately one after another in the chain are connected in each case through a second low-resistance, high-inductance connection and a second high-resistance, low-inductance connection that is connected in parallel thereto. A converter circuit, an energy converter, and a vehicle are also disclosed.

A modular intermediate circuit for a power converter has at least two or more intermediate circuit capacitor modules connected in parallel and in a chain, each intermediate circuit capacitor module having a first terminal, a second terminal, and at least one first intermediate circuit capacitor, which is electrically connected with the first terminal and the second terminal. First terminals of the intermediate circuit capacitor modules each following immediately one after another in the chain are connected in each case through a first low-resistance, high-inductance connection and a first high-resistance, low-inductance connection that is connected in parallel thereto. Second terminals of the intermediate circuit capacitor modules each following immediately one after another in the chain are connected in each case through a second low-resistance, high-inductance connection and a second high-resistance, low-inductance connection that is connected in parallel thereto. A converter circuit, an energy converter, and a vehicle are also disclosed.

A railway car fitted with an induction generator comprising magnets and electrical conductors for generating electricity, comprising a chassis comprising at least one axle with two wheels, wherein the axle is mounted in two bearings located near the two sides of the railway car, wherein the wheels are located on the outer side of the bearings, and wherein the generator comprises a rotor and a substantially cylindrical stator, which stator extends concentrically around the rotor, wherein the rotor is fixedly mounted around and on the axle, wherein the stator is mounted to the inner side of one of the bearings, in axial abutment therewith.

A railway car fitted with an induction generator comprising magnets and electrical conductors for generating electricity, comprising a chassis comprising at least one axle with two wheels, wherein the axle is mounted in two bearings located near the two sides of the railway car, wherein the wheels are located on the outer side of the bearings, and wherein the generator comprises a rotor and a substantially cylindrical stator, which stator extends concentrically around the rotor, wherein the rotor is fixedly mounted around and on the axle, wherein the stator is mounted to the inner side of one of the bearings, in axial abutment therewith.

An assembly secures a connector of an external power supply in a rail vehicle. The connector is enclosed by a housing and by a rotatably mounted flap. The flap and the housing each have a slot configured to receive a catch. The flap can have two positions: a first position, in which the flap covers the connector and thus prevents access to the connector, and a second position, in which access to the connector is possible. The flap supports a lock cylinder, which can be switched by a key into two states: in a first state, the key can be pulled out of the lock cylinder, and in a second state, the key is secured in the lock cylinder against removal. A catch is rotated into both slots or out of both slots by the lock cylinder.

An assembly secures a connector of an external power supply in a rail vehicle. The connector is enclosed by a housing and by a rotatably mounted flap. The flap and the housing each have a slot configured to receive a catch. The flap can have two positions: a first position, in which the flap covers the connector and thus prevents access to the connector, and a second position, in which access to the connector is possible. The flap supports a lock cylinder, which can be switched by a key into two states: in a first state, the key can be pulled out of the lock cylinder, and in a second state, the key is secured in the lock cylinder against removal. A catch is rotated into both slots or out of both slots by the lock cylinder.