Support structures for transportation systems

A support structure configured to support one or more devices in a transportation system, the support structure comprising:

• a base plate;
• a receiver body comprising:
• an inner wall that defines a receiver chamber sized and shaped to receive a mast that supports the one or more devices;
• a hinge element extending radially outward from an outer wall of the receiver body, the hinge element pivotally connected to the base plate;
• and
• a flange at a lower portion of the receiver body, the flange extending circumferentially about the outer wall of the receiver body, and one or more fasteners to connect the flange to the base plate,
• wherein the receiver body comprises a seamless, monolithic structure.

An electrical device mounting assembly configured to mount an electrical device to a support structure in a transportation system, the assembly comprising:

• a fitting having a wall that defines an internal channel;
• a ball seat mechanically connected to a lateral side surface of the fitting, with the wall of the fitting between the ball seat and the internal channel;
• a ball joint received within the ball seat and configured to connect to an electrical device, the ball joint configured to rotate relative to the ball seat;
• a nut disposed over the ball joint and connected to the ball seat to laterally constrain the ball joint relative to the balls seat,
• wherein one or more of the fitting, the ball seat, the ball joint, and the nut are seamless, monolithic bodies.