一种结构，如桥梁（铁路，路，步行或骑马），railway structure which is used to carry railway tracks above the general level of the ground and is usually made up of a continuous series of bridges or trestles
" class="glossaryLink ">高架桥挡土墙、隧道或类似工程，Visual indication passed to a train driver to advise the speed, direction or route of the train. There are almost as many types of signals as there are railways but they fall into the following main categories:1) handsignals - used mainly where there are no fixed signals or where the fixed signalling has failed. 2) semaphore signals - a fixed lineside signal where the stop indication is displayed as a horizontally positioned arm and proceed as a 45º or vertical arm. 3) colour light signal - a fixed lineside signal showing light indications to drivers. 4) cab signals - where the indications are displayed in the driver's cab.
" class="glossaryLink ">信号或电气化柱或龙门架、车站施工，如站台墙、轨道排水人孔或电缆坑，以及电网轨道上的任何其他施工亚搏彩票软件官网基础设施.
