Features such as trackless doors, mercury-type door interlocks, roof-mounted door fault indicator lights, rubber window glazing, improved retractable shoegear and a modified electro-pneumatic brake system designed to facilitate maintenance and improve reliability, which have proved their worth on the prototype trains, are continued in the new stock.
Source: wiktionary
In the third case, the need to provide retractable shoegear on the power bogies to pick up current from the third rail, and the equipment to use low-voltage supply, has complicated the design of the Eurostar trains.
Source: wiktionary
Here shoegear and stepboards are refitted prior to a commissioning run conducted by the manufacturer which includes high speed and emergency brake tests.
Source: wiktionary
The trains run on two additional rails and pick up current by means of shoegear making sliding contact with the conductor rails.
Source: wiktionary