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The "Lock and Block" Series

The majority of Signal boxes in the UK were provided with conventional “Block Instruments” as the means of communicating between boxes and maintaining safe spacing of trains. In the densely trafficked areas of major cities such as the suburbs of London and Glasgow however, addition safeguards were necessary and to meet this need, W.R. Sykes developed his Lock and Block system which ensured that signals were interlocked with both Block Indications and train movements – long before the development of Track Circuits

This series fully implements All aspects of Lock and Block operation, including the particular variations of the system as implemented by different Railway Companies.

Simulation of the Lock and Block system is UNIQUE to Blockpost Simulations and we intend to further develop this range in the future.

Please note that Simulaions from this series are not suitable for those who do not feel confident in the basic operation of block bells and instruments – there is simply too much happening! Please try an example from the Beginner's Series for your first experience!

Gloucester Road Junction – BR (Southern Region), 1950

Gloucester Road JunctionLocated at the heart of the “Croydon Tangle”. Gloucester Road handled much of the outer suburban and local traffic of the London Brighton and South Coast and later the Southern Railway in the Croydon area. Comprising a mere 38 working levers, you could be deceived into thinking this was an “easy” box. Nothing could be further form the truth – with no less than six double track block sections and four double junctions, this is an extreme signalling challenge – add to this a very dense traffic pattern and it is easy to see why this ‘box was replaced by a Power installation as long ago as 1954


Difficulty Rating:- 9.5 out of 10

Purchase Price:- £37.50