HowTo/Scenery/category-era
From TrainzOnline
category-era-#
This is an optional tag.
Data type string
This tag is used to specify what eras an asset would be used in. For example an object listed as being in the 2000's would not expect to be used in a route that was set in the in 1930s. So this tag is a way of telling the user of the asset what era it was designed for.
The data item are set out the blocks of ten years. So valid date would be 1900s, 1910s, 1920s etc. They can be separated by a comma in a list. Example category-era "1970s;1980s;1990s;2000s;2010s". So in this example the asset is from the years 1970 to 2019