What does SHI mean in ASSEMBLY

Standing Hold Instruction (SHI) instructs a train driver to keep the train still. It is commonly used in signal boxes to temporarily stop trains from moving while they are stationary.

Signal boxes use SHI to manage and control traffic on the railway, ensuring that trains are kept safe and running efficiently. By keeping trains stationary for a short period of time, it allows for other trains or vehicles to pass first and then the train can safely start moving again.

Generally, a train should stay stationary when given SHI until it receives permission from the signal box operator to move again. The length of time will vary depending on the particular circumstances and individual signal box instructions.

If a train does not comply with SHI, then this is likely to cause delays for other services as well as potentially endanger lives as there may be another train or vehicle approaching at speed or another obstruction. As such, it is important that all drivers comply with any standing hold instructions they are given.

Drivers will receive notification of an SHI inside their cab either through flashing lights or indicators on instrumentation panels which clearly display the instruction ‘Standing Hold Instruction’.

Yes - depending on where you are travelling, there may be different instructions associated with standing hold instructions and these can often vary from place to place and even between companies operating on different parts of the network. It is therefore important that drivers familiarise themselves with localised guidelines when driving in unfamiliar territory.

Yes - if you need assistance in understanding or interpreting an SHI, you can contact the relevant area’s signaller who will be able to help explain what action should be taken next.

Yes - while written rules exist in terms of how an SHI should be navigated, each signaller may have their own personal preferences when it comes to dealing with such requests from drivers; so it is always good practice to ask for clarification if ever unsure what course of action should be taken next.

In some cases, requests made by drivers for indications may be denied due to potential safety concerns or lack of available resources within an area; however this can also depend upon other factors such as staffing levels or technical limitations so it is always advisable to check with your local signalling team first before attempting anything which could potentially put yourself or others at risk.

You will obtain information regarding signal box layout plans, route restrictions/permissions surrounding the area you wish to travel through as well as any directions regarding how those routes must be followed in order for your journey to remain safe and efficient.