Definition
An operational close call is defined as any unsafe act (formerly termed irregular working) or unsafe condition that in different circumstances could have led to an accident or personal injury or could have resulted in damage to property or equipment. These are occasions where no one was hurt or nothing was damaged, but this is more by chance than by the application of systemic controls.
This measure comprises the number of incidents of operational close calls (OCCs) that introduce significant risk to the railway (categorised as potentially significant and potentially severe) based on an evaluation of their actual or potential consequence.
Operational Close Calls results
| 2014/15 | 2015/16 | 2016/17 | 2017/18 | 2018/19 | 2019/20 |
|
|---|---|---|---|---|---|---|
| OCCS网络范围 | 36.38 | 22.31 | 23.92 | 17.85 | 9.92 |
18.77 |
| 潜在的重要意义 | 333 | 218 | 251. | 168. | 88. | 124. |
| 潜在的严重 | 140. | 72. | 59. | 64. | 41. | 120. |
操作密切呼叫的类别
保护
An OCC involving the work group (e.g. Controller of Site Safety (COSS) or a lookout) which results in incorrect or inadequate implementation of a line blockage, working outside of the protection limits or removal of protection. This includes near misses with staff whilst red zone working (areas where trains are still running), staff being slow to clear the line, or a failure to have a safe system of work in place.
占有
An OCC involving implementation of a possession (i.e. Person In Charge of a Possession (PICOP), Engineering Supervisor, Nominated Person) which results in the incorrect placement of protection, inadequate or incorrect protection arranged, or irregularity in the removal of protection. Isolation placed incorrectly (i.e. outside of possession limits or prior to the possession being taken, trolleys placed outside of possession limits).
Operating
由于操作员（例如，签名者或控制器）的任何OCC，允许使用尚未通过工作现场的火车奠定保护的许可;将火车指向陷入困境的占有/线路堵塞，车辆或行人在栅栏之间陷入普通的交叉口或在线时交叉许可;没有小心火车;当签名者处于领先地位时误解;两列列车;火车路由到孤立的部分，切换事件。
On Track Machine or Plant / Engineering Train / Equipment
Any OCC involving on track plant or engineering trains or involving incorrect use or placement of equipment or materials, for example unauthorised movements within possessions, machines or plant overturning, unsafe operation of machines or plant, equipment or materials fouling the running line, irregularities involving scaffolding on operational infrastructure.
Commentary
分类为潜在的重要或可能严重的事件归因于四类OCC中的一个。OCC类别，潜在的重要和潜在严重的事件比例最大，是保护事件。
虽然今年潜在的千原党人和严重事件的数量增加，但必须指出的是，不当事件的数量减少了43％。