A piece of timber marked with the lengths of various trains has been very useful for final checking of the design. It is planned to run trains with a locomotive and 8 carriages. Some typical train lengths are:

The design needs to take account of train size for automatic control: the sections between signals need to be slightly larger than the maximum train length and "blocks" for automatic operation will probably follow the signal positions. Each block needs two train detectors: one to sense occupancy, and another to sense the train being at the end of the block so that it can be told to stop.

Some detective work led to the following measurements:

block_zone_sizing