Abstract: A train control system includes a positioning system and consults a database to determine when the train is approaching a configurable device such as a switch or grade crossing gate. The system continuously interrogates the device to determine its status as the train approaches the device, and forces an engineer/conductor to acknowledge any detected malfunction. The train is forced to come to a complete stop before proceeding past the device or may be slowed down to a speed that will allow the engineer/conductor to visually determine whether it is safe to proceed past the device if the engineer/conductor acknowledges a message warning of the malfunction and will stop the train if the engineer/conductor fails to acknowledge the warning message.

Abstract: Supports such as a pallet carrying aircraft passenger seats or a bottom of a freight container are secured to a floor structure in an aircraft. For this purpose the floor structure includes floor stringers (5) supported on and secured to floor joists (11). The stringers (5) are U-rails having an upwardly open U-cross-section with a first interlocking member (8) in the U-cross-section. An adapter (4, 13) having a present existing stud (8) and shear pin system (8A) is secured in the U-rail of the stringers (5). The adapter (4) is secured to or securable to the support by a latching (2, 3). Another adapter (13) carries rotatable rollers or roller balls that project slightly above an upwardly facing floor level to permit, for example, freight containers or seat pallets to roll along the floor. Instead of adapter (13) it is also possible to install a present existing container latch carrier (14) in the present stringer (5).