2 parallel trenches under rails separated by 4.38m. Each trench, 40ft long and 3ft 8in deep, received ash dumped from steam loco ashpans.
When a local dump site was not available, the ash was shovelled from the pit onto the surrounding ground for later collection or directly into an open wagon left standing on an adjacent line.
A water hose could be used to wash ash from a loco's ash pan, and so a drain was provided in the pit floor to remove excess water.
The model is scripted to work with locomotives equipped to accumulate and dump ash. Examples of such locos can be found in Potteries Loop Line and Settle & Carlisle (TANE Rail-Sim release) payware routes.
A 12m apron around 3 sides has been provided to cover the digholes required to expose the model's pit. The apron at one end has been reduced to 2m to allow for other pits nearby and in line with this pair.