Building and Operating a Realistic Model Railway by Allen Jackson

Author:Allen Jackson
Language: eng
Format: epub
ISBN: 9781785001703
Publisher: Crowood

Fig. 126 Absolute block working.

In Fig. 126, there is a representation, at a most basic level, of the structure of a block section. Network Rail’s actual locations may be different for mainly operational reasons and there may well be more signals in the sections at busier parts of the railway.

The red signals are called ‘home’ signals and they are stop or go. Stop is termed ON and go is termed OFF. The yellow signal is a distant signal and is a function of a train’s weight and speed in that it might take a mile (1.6km) to stop a heavy train that is going fast. The distant signal gives the driver a warning that the next signal will be stop if the signal is ON and to start braking immediately. Colour light signals’ functions vary and we will cover those later. The layout will not have any distant signals – there is not enough space to warrant them but there could be if further baseboards were inserted between the station and fiddle yard boards. This has already been accommodated for with the wiring arrangements.

Double tracks are always described as ‘up’ and ‘down’ and the convention has been that trains always travel up to London, but there are local variations. At Scropton Crossing, up is towards Derby.

An outline of the communication between the two signal boxes, A and b, to pass a class 1 express passenger train between them

Signal Box A

Signal Box B

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