Miscellaneous Accessory Series Coal Bin 2 extension
The MAS series contains what would be known in Film/Stage/TV circles as 'set dressing' - smaller items added to the overall scene to give it character by adding details of an appropriate locale and period.
Up until the second half of the twentieth century, the railways didn't just run on coal: they delivered it all over the UK. Any station that had a goods yard almost certainly also had a coal business attached: the coal would arrive in railway wagons, and either discharged or unloaded by hand into bins, which, more often than not, were liitle more than open pens made from old railway sleepers.
The coal would then be bagged as required and delivered by horse and cart, or later by steam engine or lorry. This version has one side missing and is intended as an extension for Coal Bin 2, where required.